20204202531 has 16 divisors (see below), whose sum is σ = 27897593760. Its totient is φ = 12991130880.

The previous prime is 20204202511. The next prime is 20204202533. The reversal of 20204202531 is 13520240202.

It is not a de Polignac number, because 20204202531 - 2¹¹ = 20204200483 is a prime.

It is a super-2 number, since 2×20204202531² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20204202498 and 20204202507.

It is not an unprimeable number, because it can be changed into a prime (20204202533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41530 + ... + 205263.

It is an arithmetic number, because the mean of its divisors is an integer number (1743599610).

Almost surely, 2^20204202531 is an apocalyptic number.

20204202531 is a deficient number, since it is larger than the sum of its proper divisors (7693391229).

20204202531 is a wasteful number, since it uses less digits than its factorization.

20204202531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247766.

The product of its (nonzero) digits is 960, while the sum is 21.

Adding to 20204202531 its reverse (13520240202), we get a palindrome (33724442733).

The spelling of 20204202531 in words is "twenty billion, two hundred four million, two hundred two thousand, five hundred thirty-one".