20402401664 has 32 divisors (see below), whose sum is σ = 40965484800. Its totient is φ = 10120868352.

The previous prime is 20402401601. The next prime is 20402401681. The reversal of 20402401664 is 46610420402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

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, 611279 + ... + 643790.

It is an arithmetic number, because the mean of its divisors is an integer number (1280171400).

Almost surely, 2^20402401664 is an apocalyptic number.

It is an amenable number.

20402401664 is an abundant number, since it is smaller than the sum of its proper divisors (20563083136).

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

20402401664 is a wasteful number, since it uses less digits than its factorization.

20402401664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1255210 (or 1255198 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 29.

The spelling of 20402401664 in words is "twenty billion, four hundred two million, four hundred one thousand, six hundred sixty-four".