27518 is a member of OEIS A114140: number of ordered sequences of coins (each of which has value 1, 2, 5, 10 or 20) which add to n, here n=20.

The count can be confirmed as follows (permalink):

INPUT

# 1, 2, 5, 10 or 20

n=20

C=Compositions(n)

count=0

for c in C:

  if 3 not in list(c) and n-3 not in list(c): # 3 and 17

    if 4 not in list(c) and n-4 not in list(c): # 4 and 16

      if 6 not in list(c) and n-6 not in list(c): # 6 and 14

        if 7 not in list(c) and n-7 not in list(c): # 7 and 13

          if 8 not in list(c) and n-8 not in list(c): # 8 and 12

            if 9 not in list(c) and n-9 not in list(c): # 9 and 11

              if 18 not in list(c) and (19 not in list(c) and 15 not in list(c)):

                count+=1

print(count)

OUTPUT

27518

27518 is an interprime number because it is at equal distance from previous prime (27509) and next prime (27527).

27518 is a junction number because it is equal to n+sod(n) for n = 27493 and 27502.

27518 can be rendered as a digit equation as follows:

(-2 + 7) / 5 = 1 ^ 8