20964257999 has 8 divisors (see below), whose sum is σ = 22238489808. Its totient is φ = 19694586240.

The previous prime is 20964257989. The next prime is 20964258023. The reversal of 20964257999 is 99975246902.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20964257999 is a prime.

It is a super-2 number, since 2×20964257999² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20964257929) 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, 1130537 + ... + 1148930.

It is an arithmetic number, because the mean of its divisors is an integer number (2779811226).

Almost surely, 2^20964257999 is an apocalyptic number.

20964257999 is a deficient number, since it is larger than the sum of its proper divisors (1274231809).

20964257999 is a wasteful number, since it uses less digits than its factorization.

20964257999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280025.

The product of its (nonzero) digits is 22044960, while the sum is 62.

The spelling of 20964257999 in words is "twenty billion, nine hundred sixty-four million, two hundred fifty-seven thousand, nine hundred ninety-nine".