20289978225 has 96 divisors (see below), whose sum is σ = 40842921600. Its totient is φ = 9793785600.

The previous prime is 20289978169. The next prime is 20289978251. The reversal of 20289978225 is 52287998202.

It is not a de Polignac number, because 20289978225 - 2³¹ = 18142494577 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1694359 + ... + 1706291.

It is an arithmetic number, because the mean of its divisors is an integer number (425447100).

Almost surely, 2^20289978225 is an apocalyptic number.

20289978225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20289978225 is an abundant number, since it is smaller than the sum of its proper divisors (20552943375).

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

20289978225 is a wasteful number, since it uses less digits than its factorization.

20289978225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12192 (or 12181 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 20289978225 in words is "twenty billion, two hundred eighty-nine million, nine hundred seventy-eight thousand, two hundred twenty-five".