20009989818625 has 64 divisors (see below), whose sum is σ = 27837512352000. Its totient is φ = 14271112166400.

The previous prime is 20009989818571. The next prime is 20009989818667. The reversal of 20009989818625 is 52681898990002.

It is a de Polignac number, because none of the positive numbers 2^k-20009989818625 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 278511207 + ... + 278583043.

It is an arithmetic number, because the mean of its divisors is an integer number (434961130500).

Almost surely, 2^{20009989818625} is an apocalyptic number.

20009989818625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20009989818625 is a deficient number, since it is larger than the sum of its proper divisors (7827522533375).

20009989818625 is a wasteful number, since it uses less digits than its factorization.

20009989818625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78787 (or 78777 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 67.

The spelling of 20009989818625 in words is "twenty trillion, nine billion, nine hundred eighty-nine million, eight hundred eighteen thousand, six hundred twenty-five".