20644386480225 has 96 divisors (see below), whose sum is σ = 39151037030400. Its totient is φ = 10654306228800.

The previous prime is 20644386480199. The next prime is 20644386480269. The reversal of 20644386480225 is 52208468344602.

20644386480225 is a `hidden beast` number, since 2 + 0 + 64 + 4 + 3 + 86 + 480 + 2 + 25 = 666.

It is not a de Polignac number, because 20644386480225 - 2⁶ = 20644386480161 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 320517874 + ... + 320582276.

It is an arithmetic number, because the mean of its divisors is an integer number (407823302400).

Almost surely, 2^{20644386480225} is an apocalyptic number.

20644386480225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20644386480225 is a deficient number, since it is larger than the sum of its proper divisors (18506650550175).

20644386480225 is a wasteful number, since it uses less digits than its factorization.

20644386480225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79772 (or 79761 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 54.

The spelling of 20644386480225 in words is "twenty trillion, six hundred forty-four billion, three hundred eighty-six million, four hundred eighty thousand, two hundred twenty-five".