20915235216 has 60 divisors (see below), whose sum is σ = 59080696272. Its totient is φ = 6906583488.

The previous prime is 20915235179. The next prime is 20915235223. The reversal of 20915235216 is 61253251902.

It is a happy number.

20915235216 is a `hidden beast` number, since 20 + 91 + 5 + 23 + 521 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 663306 + ... + 694121.

Almost surely, 2^20915235216 is an apocalyptic number.

It is an amenable number.

20915235216 is an abundant number, since it is smaller than the sum of its proper divisors (38165461056).

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

20915235216 is a wasteful number, since it uses less digits than its factorization.

20915235216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357548 (or 1357539 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 20915235216 in words is "twenty billion, nine hundred fifteen million, two hundred thirty-five thousand, two hundred sixteen".