20156515544 has 32 divisors (see below), whose sum is σ = 41249129040. Its totient is φ = 9157632000.

The previous prime is 20156515529. The next prime is 20156515553. The reversal of 20156515544 is 44551565102.

It is a junction number, because it is equal to n+sod(n) for n = 20156515498 and 20156515507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131744 + ... + 240144.

Almost surely, 2^20156515544 is an apocalyptic number.

It is an amenable number.

20156515544 is an abundant number, since it is smaller than the sum of its proper divisors (21092613496).

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

20156515544 is a wasteful number, since it uses less digits than its factorization.

20156515544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110531 (or 110527 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

The spelling of 20156515544 in words is "twenty billion, one hundred fifty-six million, five hundred fifteen thousand, five hundred forty-four".