20263091915721 has 16 divisors (see below), whose sum is σ = 27042330055680. Its totient is φ = 13496295859200.

The previous prime is 20263091915713. The next prime is 20263091915723. The reversal of 20263091915721 is 12751919036202.

It is not a de Polignac number, because 20263091915721 - 2³ = 20263091915713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20263091915723) 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, 15654936 + ... + 16899798.

It is an arithmetic number, because the mean of its divisors is an integer number (1690145628480).

Almost surely, 2^{20263091915721} is an apocalyptic number.

It is an amenable number.

20263091915721 is a deficient number, since it is larger than the sum of its proper divisors (6779238139959).

20263091915721 is a wasteful number, since it uses less digits than its factorization.

20263091915721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249856.

The product of its (nonzero) digits is 408240, while the sum is 48.

The spelling of 20263091915721 in words is "twenty trillion, two hundred sixty-three billion, ninety-one million, nine hundred fifteen thousand, seven hundred twenty-one".