20404131513 has 8 divisors (see below), whose sum is σ = 27223284576. Its totient is φ = 13593866400.

The previous prime is 20404131511. The next prime is 20404131571. The reversal of 20404131513 is 31513140402.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20404131513 - 2¹ = 20404131511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20404131511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2216628 + ... + 2225813.

It is an arithmetic number, because the mean of its divisors is an integer number (3402910572).

Almost surely, 2^20404131513 is an apocalyptic number.

It is an amenable number.

20404131513 is a deficient number, since it is larger than the sum of its proper divisors (6819153063).

20404131513 is a wasteful number, since it uses less digits than its factorization.

20404131513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4443975.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 20404131513 its reverse (31513140402), we get a palindrome (51917271915).

The spelling of 20404131513 in words is "twenty billion, four hundred four million, one hundred thirty-one thousand, five hundred thirteen".