20976631169 has 8 divisors (see below), whose sum is σ = 22605785832. Its totient is φ = 19349700480.

The previous prime is 20976631157. The next prime is 20976631229. The reversal of 20976631169 is 96113667902.

It can be written as a sum of positive squares in 4 ways, for example, as 10261690000 + 10714941169 = 101300^2 + 103513^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20976631169 - 2¹² = 20976627073 is a prime.

It is a super-2 number, since 2×20976631169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20976631069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536372 + ... + 574149.

It is an arithmetic number, because the mean of its divisors is an integer number (2825723229).

Almost surely, 2^20976631169 is an apocalyptic number.

It is an amenable number.

20976631169 is a deficient number, since it is larger than the sum of its proper divisors (1629154663).

20976631169 is a wasteful number, since it uses less digits than its factorization.

20976631169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111987.

The product of its (nonzero) digits is 734832, while the sum is 50.

The spelling of 20976631169 in words is "twenty billion, nine hundred seventy-six million, six hundred thirty-one thousand, one hundred sixty-nine".