20516521274 has 8 divisors (see below), whose sum is σ = 31079483028. Its totient is φ = 10156693600.

The previous prime is 20516521273. The next prime is 20516521331. The reversal of 20516521274 is 47212561502.

It can be written as a sum of positive squares in 2 ways, for example, as 19394740225 + 1121781049 = 139265^2 + 33493^2 .

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

It is not an unprimeable number, because it can be changed into a prime (20516521273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50783267 + ... + 50783670.

Almost surely, 2^20516521274 is an apocalyptic number.

20516521274 is a deficient number, since it is larger than the sum of its proper divisors (10562961754).

20516521274 is a wasteful number, since it uses less digits than its factorization.

20516521274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101567040.

The product of its (nonzero) digits is 33600, while the sum is 35.

The spelling of 20516521274 in words is "twenty billion, five hundred sixteen million, five hundred twenty-one thousand, two hundred seventy-four".