20320969 has 2 divisors, whose sum is σ = 20320970. Its totient is φ = 20320968.

The previous prime is 20320961. The next prime is 20320987. The reversal of 20320969 is 96902302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19474569 + 846400 = 4413^2 + 920^2 .

It is a cyclic number.

It is not a de Polignac number, because 20320969 - 2³ = 20320961 is a prime.

It is a super-2 number, since 2×20320969² = 825883562197922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20320969.

It is not a weakly prime, because it can be changed into another prime (20320961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160484 + 10160485.

It is an arithmetic number, because the mean of its divisors is an integer number (10160485).

Almost surely, 2^20320969 is an apocalyptic number.

It is an amenable number.

20320969 is a deficient number, since it is larger than the sum of its proper divisors (1).

20320969 is an equidigital number, since it uses as much as digits as its factorization.

20320969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 20320969 is about 4507.8785476097. The cubic root of 20320969 is about 272.8861355224.

The spelling of 20320969 in words is "twenty million, three hundred twenty thousand, nine hundred sixty-nine".