20765343707251 has 32 divisors (see below), whose sum is σ = 24826223197440. Its totient is φ = 17118316828800.

The previous prime is 20765343707201. The next prime is 20765343707261. The reversal of 20765343707251 is 15270734356702.

It is not a de Polignac number, because 20765343707251 - 2²⁷ = 20765209489523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20765343707201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11412016 + ... + 13105906.

It is an arithmetic number, because the mean of its divisors is an integer number (775819474920).

Almost surely, 2^{20765343707251} is an apocalyptic number.

20765343707251 is a deficient number, since it is larger than the sum of its proper divisors (4060879490189).

20765343707251 is a wasteful number, since it uses less digits than its factorization.

20765343707251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695427.

The product of its (nonzero) digits is 7408800, while the sum is 52.

The spelling of 20765343707251 in words is "twenty trillion, seven hundred sixty-five billion, three hundred forty-three million, seven hundred seven thousand, two hundred fifty-one".