20315204531 has 8 divisors (see below), whose sum is σ = 20794246704. Its totient is φ = 19836462240.

The previous prime is 20315204521. The next prime is 20315204543. The reversal of 20315204531 is 13540251302.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20315204531 - 2⁶ = 20315204467 is a prime.

It is a super-2 number, since 2×20315204531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20315204531.

It is not an unprimeable number, because it can be changed into a prime (20315204521) 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, 65165 + ... + 211841.

It is an arithmetic number, because the mean of its divisors is an integer number (2599280838).

Almost surely, 2^20315204531 is an apocalyptic number.

20315204531 is a deficient number, since it is larger than the sum of its proper divisors (479042173).

20315204531 is a wasteful number, since it uses less digits than its factorization.

20315204531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149941.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 20315204531 its reverse (13540251302), we get a palindrome (33855455833).

The spelling of 20315204531 in words is "twenty billion, three hundred fifteen million, two hundred four thousand, five hundred thirty-one".