20425660764 has 12 divisors (see below), whose sum is σ = 47659875144. Its totient is φ = 6808553584.

The previous prime is 20425660733. The next prime is 20425660771. The reversal of 20425660764 is 46706652402.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 851069187 + ... + 851069210.

It is an arithmetic number, because the mean of its divisors is an integer number (3971656262).

Almost surely, 2^20425660764 is an apocalyptic number.

It is an amenable number.

20425660764 is an abundant number, since it is smaller than the sum of its proper divisors (27234214380).

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

20425660764 is a wasteful number, since it uses less digits than its factorization.

20425660764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702138404 (or 1702138402 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 20425660764 in words is "twenty billion, four hundred twenty-five million, six hundred sixty thousand, seven hundred sixty-four".