20257963902 has 48 divisors (see below), whose sum is σ = 48785928048. Its totient is φ = 6022947840.

The previous prime is 20257963879. The next prime is 20257963903. The reversal of 20257963902 is 20936975202.

It is a happy number.

20257963902 is a `hidden beast` number, since 2 + 0 + 2 + 5 + 7 + 9 + 639 + 0 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20257963903) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 954723 + ... + 975710.

It is an arithmetic number, because the mean of its divisors is an integer number (1016373501).

Almost surely, 2^20257963902 is an apocalyptic number.

20257963902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20257963902 is an abundant number, since it is smaller than the sum of its proper divisors (28527964146).

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

20257963902 is a wasteful number, since it uses less digits than its factorization.

20257963902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930505 (or 1930502 counting only the distinct ones).

The product of its (nonzero) digits is 408240, while the sum is 45.

The spelling of 20257963902 in words is "twenty billion, two hundred fifty-seven million, nine hundred sixty-three thousand, nine hundred two".