20979276365 has 4 divisors (see below), whose sum is σ = 25175131644. Its totient is φ = 16783421088.

The previous prime is 20979276337. The next prime is 20979276389. The reversal of 20979276365 is 56367297902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12688445449 + 8290830916 = 112643^2 + 91054^2 .

It is a cyclic number.

It is not a de Polignac number, because 20979276365 - 2¹² = 20979272269 is a prime.

It is a super-2 number, since 2×20979276365² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20979276365.

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, 2097927632 + ... + 2097927641.

It is an arithmetic number, because the mean of its divisors is an integer number (6293782911).

Almost surely, 2^20979276365 is an apocalyptic number.

It is an amenable number.

20979276365 is a deficient number, since it is larger than the sum of its proper divisors (4195855279).

20979276365 is an equidigital number, since it uses as much as digits as its factorization.

20979276365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4195855278.

The product of its (nonzero) digits is 8573040, while the sum is 56.

The spelling of 20979276365 in words is "twenty billion, nine hundred seventy-nine million, two hundred seventy-six thousand, three hundred sixty-five".