20404012531 has 40 divisors (see below), whose sum is σ = 24775405200. Its totient is φ = 16782413760.

The previous prime is 20404012529. The next prime is 20404012547. The reversal of 20404012531 is 13521040402.

It is not a de Polignac number, because 20404012531 - 2¹ = 20404012529 is a prime.

It is a super-2 number, since 2×20404012531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20404012331) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 12602040 + ... + 12603658.

It is an arithmetic number, because the mean of its divisors is an integer number (619385130).

Almost surely, 2^20404012531 is an apocalyptic number.

20404012531 is a deficient number, since it is larger than the sum of its proper divisors (4371392669).

20404012531 is an equidigital number, since it uses as much as digits as its factorization.

20404012531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1857 (or 1836 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 20404012531 its reverse (13521040402), we get a palindrome (33925052933).

The spelling of 20404012531 in words is "twenty billion, four hundred four million, twelve thousand, five hundred thirty-one".