20925936965 has 8 divisors (see below), whose sum is σ = 25127997720. Its totient is φ = 16729500672.

The previous prime is 20925936937. The next prime is 20925937013. The reversal of 20925936965 is 56963952902.

It is a Cunningham number, because it is equal to 144658²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 4480695844 + 16445241121 = 66938^2 + 128239^2 .

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 20925936965 - 2¹² = 20925932869 is a prime.

It is a super-2 number, since 2×20925936965² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20925936965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1397924 + ... + 1412813.

It is an arithmetic number, because the mean of its divisors is an integer number (3140999715).

Almost surely, 2^20925936965 is an apocalyptic number.

It is an amenable number.

20925936965 is a deficient number, since it is larger than the sum of its proper divisors (4202060755).

20925936965 is a wasteful number, since it uses less digits than its factorization.

20925936965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2812231.

The product of its (nonzero) digits is 7873200, while the sum is 56.

The spelling of 20925936965 in words is "twenty billion, nine hundred twenty-five million, nine hundred thirty-six thousand, nine hundred sixty-five".