20315231516 has 12 divisors (see below), whose sum is σ = 35615486088. Its totient is φ = 10139378352.

The previous prime is 20315231501. The next prime is 20315231527. The reversal of 20315231516 is 61513251302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4556846 + ... + 4561301.

It is an arithmetic number, because the mean of its divisors is an integer number (2967957174).

Almost surely, 2^20315231516 is an apocalyptic number.

It is an amenable number.

20315231516 is a deficient number, since it is larger than the sum of its proper divisors (15300254572).

20315231516 is a wasteful number, since it uses less digits than its factorization.

20315231516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9118708 (or 9118706 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

Adding to 20315231516 its reverse (61513251302), we get a palindrome (81828482818).

The spelling of 20315231516 in words is "twenty billion, three hundred fifteen million, two hundred thirty-one thousand, five hundred sixteen".