20564242501625 has 32 divisors (see below), whose sum is σ = 27174384776448. Its totient is φ = 15483349958400.

The previous prime is 20564242501613. The next prime is 20564242501631. The reversal of 20564242501625 is 52610524246502.

It is not a de Polignac number, because 20564242501625 - 2¹⁸ = 20564242239481 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201830444 + ... + 201932306.

It is an arithmetic number, because the mean of its divisors is an integer number (849199524264).

Almost surely, 2^{20564242501625} is an apocalyptic number.

20564242501625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20564242501625 is a deficient number, since it is larger than the sum of its proper divisors (6610142274823).

20564242501625 is a wasteful number, since it uses less digits than its factorization.

20564242501625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196898 (or 196888 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 44.

The spelling of 20564242501625 in words is "twenty trillion, five hundred sixty-four billion, two hundred forty-two million, five hundred one thousand, six hundred twenty-five".