20999692051 has 32 divisors (see below), whose sum is σ = 25320992256. Its totient is φ = 17224704000.

The previous prime is 20999692039. The next prime is 20999692057. The reversal of 20999692051 is 15029699902.

It is a cyclic number.

It is not a de Polignac number, because 20999692051 - 2²⁹ = 20462821139 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20999692051.

It is not an unprimeable number, because it can be changed into a prime (20999692057) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 243511 + ... + 318271.

It is an arithmetic number, because the mean of its divisors is an integer number (791281008).

Almost surely, 2^20999692051 is an apocalyptic number.

20999692051 is a deficient number, since it is larger than the sum of its proper divisors (4321300205).

20999692051 is a wasteful number, since it uses less digits than its factorization.

20999692051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74863.

The product of its (nonzero) digits is 787320, while the sum is 52.

The spelling of 20999692051 in words is "twenty billion, nine hundred ninety-nine million, six hundred ninety-two thousand, fifty-one".