20515556130540 has 48 divisors (see below), whose sum is σ = 57444248367072. Its totient is φ = 5470749139456.

The previous prime is 20515556130539. The next prime is 20515556130541. The reversal of 20515556130540 is 4503165551502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20515556130539) and next prime (20515556130541).

It is a junction number, because it is equal to n+sod(n) for n = 20515556130492 and 20515556130501.

It is not an unprimeable number, because it can be changed into a prime (20515556130541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3076702 + ... + 7106138.

It is an arithmetic number, because the mean of its divisors is an integer number (1196755174314).

Almost surely, 2^{20515556130540} is an apocalyptic number.

20515556130540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20515556130540 is an abundant number, since it is smaller than the sum of its proper divisors (36928692236532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20515556130540 is a wasteful number, since it uses less digits than its factorization.

20515556130540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4114306 (or 4114304 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 42.

The spelling of 20515556130540 in words is "twenty trillion, five hundred fifteen billion, five hundred fifty-six million, one hundred thirty thousand, five hundred forty".