20922789887945 has 16 divisors (see below), whose sum is σ = 27389926647360. Its totient is φ = 15216523012800.

The previous prime is 20922789887929. The next prime is 20922789887947. The reversal of 20922789887945 is 54978898722902.

It is not a de Polignac number, because 20922789887945 - 2⁴ = 20922789887929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20922789887945.

It is not an unprimeable number, because it can be changed into a prime (20922789887947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24936311 + ... + 25761699.

It is an arithmetic number, because the mean of its divisors is an integer number (1711870415460).

Almost surely, 2^{20922789887945} is an apocalyptic number.

It is an amenable number.

20922789887945 is a deficient number, since it is larger than the sum of its proper divisors (6467136759415).

20922789887945 is a wasteful number, since it uses less digits than its factorization.

20922789887945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286296.

The product of its (nonzero) digits is 2926264320, while the sum is 80.

The spelling of 20922789887945 in words is "twenty trillion, nine hundred twenty-two billion, seven hundred eighty-nine million, eight hundred eighty-seven thousand, nine hundred forty-five".