20402064644660 has 48 divisors (see below), whose sum is σ = 42863683524480. Its totient is φ = 8157141233280.

The previous prime is 20402064644623. The next prime is 20402064644681. The reversal of 20402064644660 is 6644646020402.

It is a congruent number.

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, 835898177 + ... + 835922583.

It is an arithmetic number, because the mean of its divisors is an integer number (892993406760).

Almost surely, 2^{20402064644660} is an apocalyptic number.

20402064644660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402064644660 is an abundant number, since it is smaller than the sum of its proper divisors (22461618879820).

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

20402064644660 is a wasteful number, since it uses less digits than its factorization.

20402064644660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41576 (or 41574 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 44.

It can be divided in two parts, 2040206 and 4644660, that added together give a palindrome (6684866).

The spelling of 20402064644660 in words is "twenty trillion, four hundred two billion, sixty-four million, six hundred forty-four thousand, six hundred sixty".