20516623416 has 24 divisors (see below), whose sum is σ = 55565855280. Its totient is φ = 6838874448.

The previous prime is 20516623403. The next prime is 20516623423. The reversal of 20516623416 is 61432661502.

20516623416 is a `hidden beast` number, since 2 + 0 + 5 + 16 + 623 + 4 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142476480 + ... + 142476623.

It is an arithmetic number, because the mean of its divisors is an integer number (2315243970).

Almost surely, 2^20516623416 is an apocalyptic number.

It is an amenable number.

20516623416 is an abundant number, since it is smaller than the sum of its proper divisors (35049231864).

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

20516623416 is a wasteful number, since it uses less digits than its factorization.

20516623416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284953115 (or 284953108 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 20516623416 in words is "twenty billion, five hundred sixteen million, six hundred twenty-three thousand, four hundred sixteen".