20400386902 has 32 divisors (see below), whose sum is σ = 35410701312. Its totient is φ = 8633474304.

The previous prime is 20400386891. The next prime is 20400386977. The reversal of 20400386902 is 20968300402.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3956358 + ... + 3961510.

It is an arithmetic number, because the mean of its divisors is an integer number (1106584416).

Almost surely, 2^20400386902 is an apocalyptic number.

20400386902 is a deficient number, since it is larger than the sum of its proper divisors (15010314410).

20400386902 is a wasteful number, since it uses less digits than its factorization.

20400386902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8652.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 20400386902 in words is "twenty billion, four hundred million, three hundred eighty-six thousand, nine hundred two".