20646757426 has 16 divisors (see below), whose sum is σ = 31185431424. Its totient is φ = 10251732384.

The previous prime is 20646757399. The next prime is 20646757447. The reversal of 20646757426 is 62475764602.

It is a super-2 number, since 2×20646757426² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20646757426.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325966 + ... + 384118.

It is an arithmetic number, because the mean of its divisors is an integer number (1949089464).

Almost surely, 2^20646757426 is an apocalyptic number.

20646757426 is a deficient number, since it is larger than the sum of its proper divisors (10538673998).

20646757426 is a wasteful number, since it uses less digits than its factorization.

20646757426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59385.

The product of its (nonzero) digits is 3386880, while the sum is 49.

The spelling of 20646757426 in words is "twenty billion, six hundred forty-six million, seven hundred fifty-seven thousand, four hundred twenty-six".