20390944466 has 16 divisors (see below), whose sum is σ = 30773070744. Its totient is φ = 10133351424.

The previous prime is 20390944421. The next prime is 20390944523. The reversal of 20390944466 is 66444909302.

It can be written as a sum of positive squares in 4 ways, for example, as 10123378225 + 10267566241 = 100615^2 + 101329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20390944466.

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, 407516 + ... + 454808.

Almost surely, 2^20390944466 is an apocalyptic number.

20390944466 is a deficient number, since it is larger than the sum of its proper divisors (10382126278).

20390944466 is a wasteful number, since it uses less digits than its factorization.

20390944466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48605.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 20390944466 in words is "twenty billion, three hundred ninety million, nine hundred forty-four thousand, four hundred sixty-six".