20402002664 has 16 divisors (see below), whose sum is σ = 38269803300. Its totient is φ = 10196721792.

The previous prime is 20402002573. The next prime is 20402002667. The reversal of 20402002664 is 46620020402.

It can be written as a sum of positive squares in 2 ways, for example, as 20252136100 + 149866564 = 142310^2 + 12242^2 .

It is not an unprimeable number, because it can be changed into a prime (20402002667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 514637 + ... + 552860.

Almost surely, 2^20402002664 is an apocalyptic number.

It is an amenable number.

20402002664 is a deficient number, since it is larger than the sum of its proper divisors (17867800636).

20402002664 is a wasteful number, since it uses less digits than its factorization.

20402002664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069892 (or 1069888 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The spelling of 20402002664 in words is "twenty billion, four hundred two million, two thousand, six hundred sixty-four".