20126699265841 has 27 divisors (see below), whose sum is σ = 23482930953657. Its totient is φ = 17199855332520.

The previous prime is 20126699265817. The next prime is 20126699265847. The reversal of 20126699265841 is 14856299662102.

The square root of 20126699265841 is 4486279.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 20126699265841 - 2⁹ = 20126699265329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20126699265841.

It is not an unprimeable number, because it can be changed into a prime (20126699265847) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 13535103000 + ... + 13535104486.

Almost surely, 2^{20126699265841} is an apocalyptic number.

20126699265841 is the 4486279-th square number.

20126699265841 is the 2243140-th centered octagonal number.

It is an amenable number.

20126699265841 is a deficient number, since it is larger than the sum of its proper divisors (3356231687816).

20126699265841 is an frugal number, since it uses more digits than its factorization.

20126699265841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850 (or 1925 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 61.

The spelling of 20126699265841 in words is "twenty trillion, one hundred twenty-six billion, six hundred ninety-nine million, two hundred sixty-five thousand, eight hundred forty-one".