20402240404 has 36 divisors (see below), whose sum is σ = 44184743904. Its totient is φ = 8071214112.

The previous prime is 20402240389. The next prime is 20402240407. The reversal of 20402240404 is 40404220402.

It is a super-2 number, since 2×20402240404² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402240407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2151042 + ... + 2160505.

Almost surely, 2^20402240404 is an apocalyptic number.

It is an amenable number.

20402240404 is an abundant number, since it is smaller than the sum of its proper divisors (23782503500).

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

20402240404 is a wasteful number, since it uses less digits than its factorization.

20402240404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4311584 (or 4311569 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 22.

Adding to 20402240404 its reverse (40404220402), we get a palindrome (60806460806).

The spelling of 20402240404 in words is "twenty billion, four hundred two million, two hundred forty thousand, four hundred four".