20423440404 has 72 divisors (see below), whose sum is σ = 54903488640. Its totient is φ = 6382996992.

The previous prime is 20423440397. The next prime is 20423440409. The reversal of 20423440404 is 40404432402.

It is a happy number.

20423440404 is a `hidden beast` number, since 20 + 4 + 234 + 4 + 0 + 404 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20423440409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87564 + ... + 220259.

Almost surely, 2^20423440404 is an apocalyptic number.

It is an amenable number.

20423440404 is an abundant number, since it is smaller than the sum of its proper divisors (34480048236).

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

20423440404 is a wasteful number, since it uses less digits than its factorization.

20423440404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307949 (or 307944 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 27.

Adding to 20423440404 its reverse (40404432402), we get a palindrome (60827872806).

The spelling of 20423440404 in words is "twenty billion, four hundred twenty-three million, four hundred forty thousand, four hundred four".