20922789887999 has 4 divisors (see below), whose sum is σ = 20929670124480. Its totient is φ = 20915909651520.

The previous prime is 20922789887947. The next prime is 20922789888023. The reversal of 20922789887999 is 99978898722902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20922789887999 - 2²⁰ = 20922788839423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20922789887929) 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, 3440113679 + ... + 3440119760.

It is an arithmetic number, because the mean of its divisors is an integer number (5232417531120).

Almost surely, 2^{20922789887999} is an apocalyptic number.

20922789887999 is a deficient number, since it is larger than the sum of its proper divisors (6880236481).

20922789887999 is an equidigital number, since it uses as much as digits as its factorization.

20922789887999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6880236480.

The product of its (nonzero) digits is 11851370496, while the sum is 89.

The spelling of 20922789887999 in words is "twenty trillion, nine hundred twenty-two billion, seven hundred eighty-nine million, eight hundred eighty-seven thousand, nine hundred ninety-nine".