20400000402 has 64 divisors (see below), whose sum is σ = 42343741440. Its totient is φ = 6547800000.

The previous prime is 20400000377. The next prime is 20400000487.

20400000402 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6538999 + ... + 6542117.

It is an arithmetic number, because the mean of its divisors is an integer number (661620960).

Almost surely, 2^20400000402 is an apocalyptic number.

20400000402 is an abundant number, since it is smaller than the sum of its proper divisors (21943741038).

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

20400000402 is a wasteful number, since it uses less digits than its factorization.

20400000402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3519.

The product of its (nonzero) digits is 64, while the sum is 12.

It can be divided in two parts, 20400000 and 402, that added together give a palindrome (20400402).

The spelling of 20400000402 in words is "twenty billion, four hundred million, four hundred two", and thus it is an aban number.