20959681025 has 12 divisors (see below), whose sum is σ = 26356063104. Its totient is φ = 16531578000.

The previous prime is 20959681007. The next prime is 20959681027. The reversal of 20959681025 is 52018695902.

It is not a de Polignac number, because 20959681025 - 2¹⁶ = 20959615489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20959681027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5902361 + ... + 5905910.

It is an arithmetic number, because the mean of its divisors is an integer number (2196338592).

Almost surely, 2^20959681025 is an apocalyptic number.

20959681025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20959681025 is a deficient number, since it is larger than the sum of its proper divisors (5396382079).

20959681025 is a wasteful number, since it uses less digits than its factorization.

20959681025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11808352 (or 11808347 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 47.

The spelling of 20959681025 in words is "twenty billion, nine hundred fifty-nine million, six hundred eighty-one thousand, twenty-five".