20040402100 has 36 divisors (see below), whose sum is σ = 43886665900. Its totient is φ = 7942613760.

The previous prime is 20040402097. The next prime is 20040402131. The reversal of 20040402100 is 120404002.

It can be written as a sum of positive squares in 6 ways, for example, as 379314576 + 19661087524 = 19476^2 + 140218^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 908385 + ... + 930184.

Almost surely, 2^20040402100 is an apocalyptic number.

20040402100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20040402100 is an abundant number, since it is smaller than the sum of its proper divisors (23846263800).

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

20040402100 is a wasteful number, since it uses less digits than its factorization.

20040402100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1838692 (or 1838685 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 13.

Adding to 20040402100 its reverse (120404002), we get a palindrome (20160806102).

The spelling of 20040402100 in words is "twenty billion, forty million, four hundred two thousand, one hundred".