20651623015 has 16 divisors (see below), whose sum is σ = 25112910816. Its totient is φ = 16301776000.

The previous prime is 20651623009. The next prime is 20651623037. The reversal of 20651623015 is 51032615602.

It is not a de Polignac number, because 20651623015 - 2⁵ = 20651622983 is a prime.

It is a Duffinian number.

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, 78180 + ... + 217750.

It is an arithmetic number, because the mean of its divisors is an integer number (1569556926).

Almost surely, 2^20651623015 is an apocalyptic number.

20651623015 is a deficient number, since it is larger than the sum of its proper divisors (4461287801).

20651623015 is a wasteful number, since it uses less digits than its factorization.

20651623015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139970.

The product of its (nonzero) digits is 10800, while the sum is 31.

The spelling of 20651623015 in words is "twenty billion, six hundred fifty-one million, six hundred twenty-three thousand, fifteen".