20654640269 has 4 divisors (see below), whose sum is σ = 20657978400. Its totient is φ = 20651302140.

The previous prime is 20654640211. The next prime is 20654640299. The reversal of 20654640269 is 96204645602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20654640269 - 2²⁴ = 20637863053 is a prime.

It is a super-2 number, since 2×20654640269² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20654640299) 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, 1659767 + ... + 1672164.

It is an arithmetic number, because the mean of its divisors is an integer number (5164494600).

Almost surely, 2^20654640269 is an apocalyptic number.

It is an amenable number.

20654640269 is a deficient number, since it is larger than the sum of its proper divisors (3338131).

20654640269 is an equidigital number, since it uses as much as digits as its factorization.

20654640269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3338130.

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 20654640269 in words is "twenty billion, six hundred fifty-four million, six hundred forty thousand, two hundred sixty-nine".