20402040404 has 12 divisors (see below), whose sum is σ = 36155515200. Its totient is φ = 10071893208.

The previous prime is 20402040403. The next prime is 20402040409. The reversal of 20402040404 is 40404020402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20402040403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32281394 + ... + 32282025.

It is an arithmetic number, because the mean of its divisors is an integer number (3012959600).

Almost surely, 2^20402040404 is an apocalyptic number.

It is an amenable number.

20402040404 is a deficient number, since it is larger than the sum of its proper divisors (15753474796).

20402040404 is a wasteful number, since it uses less digits than its factorization.

20402040404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64563502 (or 64563500 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 20402040404 its reverse (40404020402), we get a palindrome (60806060806).

The spelling of 20402040404 in words is "twenty billion, four hundred two million, forty thousand, four hundred four".