20440604626640 has 80 divisors (see below), whose sum is σ = 51847860810240. Its totient is φ = 7432509212160.

The previous prime is 20440604626627. The next prime is 20440604626697. The reversal of 20440604626640 is 4662640604402.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 20440604626591 and 20440604626600.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14450657 + ... + 15801983.

It is an arithmetic number, because the mean of its divisors is an integer number (648098260128).

Almost surely, 2^{20440604626640} is an apocalyptic number.

20440604626640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440604626640 is an abundant number, since it is smaller than the sum of its proper divisors (31407256183600).

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

20440604626640 is a wasteful number, since it uses less digits than its factorization.

20440604626640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368540 (or 1368534 counting only the distinct ones).

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

The spelling of 20440604626640 in words is "twenty trillion, four hundred forty billion, six hundred four million, six hundred twenty-six thousand, six hundred forty".