20851851798 has 96 divisors (see below), whose sum is σ = 47234547360. Its totient is φ = 6642155520.

The previous prime is 20851851767. The next prime is 20851851821. The reversal of 20851851798 is 89715815802.

20851851798 is a `hidden beast` number, since 2 + 0 + 8 + 518 + 51 + 79 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27115158 + ... + 27115926.

It is an arithmetic number, because the mean of its divisors is an integer number (492026535).

Almost surely, 2^20851851798 is an apocalyptic number.

20851851798 is an abundant number, since it is smaller than the sum of its proper divisors (26382695562).

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

20851851798 is a wasteful number, since it uses less digits than its factorization.

20851851798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1534 (or 1531 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 54.

The spelling of 20851851798 in words is "twenty billion, eight hundred fifty-one million, eight hundred fifty-one thousand, seven hundred ninety-eight".