20156516415 has 128 divisors (see below), whose sum is σ = 43190323200. Its totient is φ = 8712852480.

The previous prime is 20156516357. The next prime is 20156516449. The reversal of 20156516415 is 51461565102.

20156516415 is a `hidden beast` number, since 2 + 0 + 1 + 5 + 6 + 5 + 1 + 641 + 5 = 666.

It is not a de Polignac number, because 20156516415 - 2¹² = 20156512319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20156516415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 16895059 + ... + 16896251.

It is an arithmetic number, because the mean of its divisors is an integer number (337424400).

Almost surely, 2^20156516415 is an apocalyptic number.

20156516415 is an abundant number, since it is smaller than the sum of its proper divisors (23033806785).

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

20156516415 is a wasteful number, since it uses less digits than its factorization.

20156516415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The spelling of 20156516415 in words is "twenty billion, one hundred fifty-six million, five hundred sixteen thousand, four hundred fifteen".