20957469969 has 4 divisors (see below), whose sum is σ = 27943293296. Its totient is φ = 13971646644.

The previous prime is 20957469961. The next prime is 20957469983. The reversal of 20957469969 is 96996475902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20957469969 - 2³ = 20957469961 is a prime.

It is a super-2 number, since 2×20957469969² (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 (20957469961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3492911659 + ... + 3492911664.

It is an arithmetic number, because the mean of its divisors is an integer number (6985823324).

Almost surely, 2^20957469969 is an apocalyptic number.

It is an amenable number.

20957469969 is a deficient number, since it is larger than the sum of its proper divisors (6985823327).

20957469969 is an equidigital number, since it uses as much as digits as its factorization.

20957469969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6985823326.

The product of its (nonzero) digits is 66134880, while the sum is 66.

The spelling of 20957469969 in words is "twenty billion, nine hundred fifty-seven million, four hundred sixty-nine thousand, nine hundred sixty-nine".