20646255151 has 4 divisors (see below), whose sum is σ = 20650009752. Its totient is φ = 20642500552.

The previous prime is 20646255107. The next prime is 20646255163. The reversal of 20646255151 is 15155264602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20646255151 - 2³¹ = 18498771503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20646255151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20646258151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1869040 + ... + 1880053.

It is an arithmetic number, because the mean of its divisors is an integer number (5162502438).

Almost surely, 2^20646255151 is an apocalyptic number.

20646255151 is a deficient number, since it is larger than the sum of its proper divisors (3754601).

20646255151 is an equidigital number, since it uses as much as digits as its factorization.

20646255151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3754600.

The product of its (nonzero) digits is 72000, while the sum is 37.

The spelling of 20646255151 in words is "twenty billion, six hundred forty-six million, two hundred fifty-five thousand, one hundred fifty-one".