20200646464 has 56 divisors (see below), whose sum is σ = 41651468640. Its totient is φ = 9708873216.

The previous prime is 20200646447. The next prime is 20200646507. The reversal of 20200646464 is 46464600202.

It is a super-2 number, since 2×20200646464² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 397339 + ... + 445285.

Almost surely, 2^20200646464 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 20200646464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20825734320).

20200646464 is an abundant number, since it is smaller than the sum of its proper divisors (21450822176).

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

20200646464 is a wasteful number, since it uses less digits than its factorization.

20200646464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48215 (or 48205 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The spelling of 20200646464 in words is "twenty billion, two hundred million, six hundred forty-six thousand, four hundred sixty-four".