20051310531 has 24 divisors (see below), whose sum is σ = 31105529280. Its totient is φ = 11455851792.

The previous prime is 20051310523. The next prime is 20051310533. The reversal of 20051310531 is 13501315002.

It is not a de Polignac number, because 20051310531 - 2³ = 20051310523 is a prime.

It is a super-2 number, since 2×20051310531² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 20051310498 and 20051310507.

It is not an unprimeable number, because it can be changed into a prime (20051310533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1288660 + ... + 1304126.

It is an arithmetic number, because the mean of its divisors is an integer number (1296063720).

Almost surely, 2^20051310531 is an apocalyptic number.

20051310531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

20051310531 is a deficient number, since it is larger than the sum of its proper divisors (11054218749).

20051310531 is a wasteful number, since it uses less digits than its factorization.

20051310531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24303 (or 24296 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

Adding to 20051310531 its reverse (13501315002), we get a palindrome (33552625533).

The spelling of 20051310531 in words is "twenty billion, fifty-one million, three hundred ten thousand, five hundred thirty-one".