20792121957 has 8 divisors (see below), whose sum is σ = 30803143680. Its totient is φ = 13861414620.

The previous prime is 20792121953. The next prime is 20792121989. The reversal of 20792121957 is 75912129702.

It is not a de Polignac number, because 20792121957 - 2² = 20792121953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20792121953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385039269 + ... + 385039322.

It is an arithmetic number, because the mean of its divisors is an integer number (3850392960).

Almost surely, 2^20792121957 is an apocalyptic number.

20792121957 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

20792121957 is a deficient number, since it is larger than the sum of its proper divisors (10011021723).

20792121957 is an equidigital number, since it uses as much as digits as its factorization.

20792121957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770078600 (or 770078594 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 45.

The spelling of 20792121957 in words is "twenty billion, seven hundred ninety-two million, one hundred twenty-one thousand, nine hundred fifty-seven".