20315556679 has 16 divisors (see below), whose sum is σ = 23131920384. Its totient is φ = 17661186400.

The previous prime is 20315556629. The next prime is 20315556683. The reversal of 20315556679 is 97665551302.

It is a happy number.

It is not a de Polignac number, because 20315556679 - 2⁹ = 20315556167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20315556619) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1323402 + ... + 1338664.

It is an arithmetic number, because the mean of its divisors is an integer number (1445745024).

Almost surely, 2^20315556679 is an apocalyptic number.

20315556679 is a deficient number, since it is larger than the sum of its proper divisors (2816363705).

20315556679 is a wasteful number, since it uses less digits than its factorization.

20315556679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20558.

The product of its (nonzero) digits is 1701000, while the sum is 49.

The spelling of 20315556679 in words is "twenty billion, three hundred fifteen million, five hundred fifty-six thousand, six hundred seventy-nine".