20531116502 has 32 divisors (see below), whose sum is σ = 34067440512. Its totient is φ = 9220581504.

The previous prime is 20531116477. The next prime is 20531116513. The reversal of 20531116502 is 20561113502.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162848 + ... + 259964.

It is an arithmetic number, because the mean of its divisors is an integer number (1064607516).

Almost surely, 2^20531116502 is an apocalyptic number.

20531116502 is a deficient number, since it is larger than the sum of its proper divisors (13536324010).

20531116502 is a wasteful number, since it uses less digits than its factorization.

20531116502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97352.

The product of its (nonzero) digits is 1800, while the sum is 26.

The spelling of 20531116502 in words is "twenty billion, five hundred thirty-one million, one hundred sixteen thousand, five hundred two".