20464042664 has 64 divisors (see below), whose sum is σ = 41887461840. Its totient is φ = 9316270080.

The previous prime is 20464042639. The next prime is 20464042681. The reversal of 20464042664 is 46624046402.

It can be written as a sum of positive squares in 8 ways, for example, as 4575440164 + 15888602500 = 67642^2 + 126050^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3154304 + ... + 3160784.

Almost surely, 2^20464042664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20464042664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20943730920).

20464042664 is an abundant number, since it is smaller than the sum of its proper divisors (21423419176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20464042664 is a wasteful number, since it uses less digits than its factorization.

20464042664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910 (or 6906 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 20464042664 in words is "twenty billion, four hundred sixty-four million, forty-two thousand, six hundred sixty-four".