20646274718 has 16 divisors (see below), whose sum is σ = 31499623680. Its totient is φ = 10147066776.

The previous prime is 20646274669. The next prime is 20646274723. The reversal of 20646274718 is 81747264602.

It is a super-2 number, since 2×20646274718² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104348 + ... + 228431.

It is an arithmetic number, because the mean of its divisors is an integer number (1968726480).

Almost surely, 2^20646274718 is an apocalyptic number.

20646274718 is a deficient number, since it is larger than the sum of its proper divisors (10853348962).

20646274718 is a wasteful number, since it uses less digits than its factorization.

20646274718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333311.

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 20646274718 in words is "twenty billion, six hundred forty-six million, two hundred seventy-four thousand, seven hundred eighteen".