20515522290156 has 72 divisors (see below), whose sum is σ = 51898737945600. Its totient is φ = 6833226342240.

The previous prime is 20515522290037. The next prime is 20515522290167. The reversal of 20515522290156 is 65109222551502.

20515522290156 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 552 + 2 + 2 + 90 + 1 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 619432165 + ... + 619465283.

It is an arithmetic number, because the mean of its divisors is an integer number (720815804800).

Almost surely, 2^{20515522290156} is an apocalyptic number.

It is an amenable number.

20515522290156 is an abundant number, since it is smaller than the sum of its proper divisors (31383215655444).

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

20515522290156 is a wasteful number, since it uses less digits than its factorization.

20515522290156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45899 (or 45894 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 20515522290156 in words is "twenty trillion, five hundred fifteen billion, five hundred twenty-two million, two hundred ninety thousand, one hundred fifty-six".