20040400400 has 30 divisors (see below), whose sum is σ = 48147062922. Its totient is φ = 8016160000.

The previous prime is 20040400363. The next prime is 20040400417. The reversal of 20040400400 is 400404002.

It can be written as a sum of positive squares in 3 ways, for example, as 5578894864 + 14461505536 = 74692^2 + 120256^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25050101 + ... + 25050900.

Almost surely, 2^20040400400 is an apocalyptic number.

20040400400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20040400400 is an abundant number, since it is smaller than the sum of its proper divisors (28106662522).

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

20040400400 is a wasteful number, since it uses less digits than its factorization.

20040400400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50101019 (or 50101008 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 20040400400 its reverse (400404002), we get a palindrome (20440804402).

The spelling of 20040400400 in words is "twenty billion, forty million, four hundred thousand, four hundred".