20664082620400 has 120 divisors (see below), whose sum is σ = 52386025695840. Its totient is φ = 7817423032320.

The previous prime is 20664082620397. The next prime is 20664082620407. The reversal of 20664082620400 is 402628046602.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20664082620407) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11799717 + ... + 13437316.

It is an arithmetic number, because the mean of its divisors is an integer number (436550214132).

Almost surely, 2^{20664082620400} is an apocalyptic number.

20664082620400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20664082620400 is an abundant number, since it is smaller than the sum of its proper divisors (31721943075440).

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

20664082620400 is a wasteful number, since it uses less digits than its factorization.

20664082620400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25237163 (or 25237152 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 20664082620400 in words is "twenty trillion, six hundred sixty-four billion, eighty-two million, six hundred twenty thousand, four hundred".