20157080634 has 64 divisors (see below), whose sum is σ = 46455120000. Its totient is φ = 6470956800.

The previous prime is 20157080627. The next prime is 20157080683. The reversal of 20157080634 is 43608075102.

20157080634 is a `hidden beast` number, since 2 + 0 + 1 + 570 + 80 + 6 + 3 + 4 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 611917 + ... + 644015.

It is an arithmetic number, because the mean of its divisors is an integer number (725861250).

Almost surely, 2^20157080634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20157080634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23227560000).

20157080634 is an abundant number, since it is smaller than the sum of its proper divisors (26298039366).

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

20157080634 is a wasteful number, since it uses less digits than its factorization.

20157080634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32540 (or 32534 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The spelling of 20157080634 in words is "twenty billion, one hundred fifty-seven million, eighty thousand, six hundred thirty-four".