20691051925 has 6 divisors (see below), whose sum is σ = 25656904418. Its totient is φ = 16552841520.

The previous prime is 20691051877. The next prime is 20691051937. The reversal of 20691051925 is 52915019602.

It can be written as a sum of positive squares in 3 ways, for example, as 98227921 + 20592824004 = 9911^2 + 143502^2 .

It is not a de Polignac number, because 20691051925 - 2²⁵ = 20657497493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 413821014 + ... + 413821063.

Almost surely, 2^20691051925 is an apocalyptic number.

20691051925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20691051925 is a deficient number, since it is larger than the sum of its proper divisors (4965852493).

20691051925 is an equidigital number, since it uses as much as digits as its factorization.

20691051925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827642087 (or 827642082 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 40.

The spelling of 20691051925 in words is "twenty billion, six hundred ninety-one million, fifty-one thousand, nine hundred twenty-five".