20502791874 has 16 divisors (see below), whose sum is σ = 45561759840. Its totient is φ = 6834263940.

The previous prime is 20502791857. The next prime is 20502791891. The reversal of 20502791874 is 47819720502.

It is a happy number.

20502791874 is a `hidden beast` number, since 2 + 0 + 502 + 79 + 1 + 8 + 74 = 666.

It is an interprime number because it is at equal distance from previous prime (20502791857) and next prime (20502791891).

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, 189840612 + ... + 189840719.

It is an arithmetic number, because the mean of its divisors is an integer number (2847609990).

Almost surely, 2^20502791874 is an apocalyptic number.

20502791874 is an abundant number, since it is smaller than the sum of its proper divisors (25058967966).

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

20502791874 is a wasteful number, since it uses less digits than its factorization.

20502791874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379681342 (or 379681336 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 20502791874 in words is "twenty billion, five hundred two million, seven hundred ninety-one thousand, eight hundred seventy-four".