20837755095921 has 9 divisors (see below), whose sum is σ = 30098999363979. Its totient is φ = 13891827600936.

The previous prime is 20837755095893. The next prime is 20837755095943. The reversal of 20837755095921 is 12959055773802.

The square root of 20837755095921 is 4564839.

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

20837755095921 is a `hidden beast` number, since 2 + 0 + 8 + 3 + 7 + 7 + 550 + 9 + 59 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16257144960225 + 4580610135696 = 4032015^2 + 2140236^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 20837755095921 - 2²³ = 20837746707313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20837755099921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12933711 + ... + 14455323.

Almost surely, 2^{20837755095921} is an apocalyptic number.

20837755095921 is the 4564839-th square number.

20837755095921 is the 2282420-th centered octagonal number.

It is an amenable number.

20837755095921 is a deficient number, since it is larger than the sum of its proper divisors (9261244268058).

20837755095921 is an frugal number, since it uses more digits than its factorization.

20837755095921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043232 (or 1521616 counting only the distinct ones).

The product of its (nonzero) digits is 47628000, while the sum is 63.

The spelling of 20837755095921 in words is "twenty trillion, eight hundred thirty-seven billion, seven hundred fifty-five million, ninety-five thousand, nine hundred twenty-one".