20895917125 has 8 divisors (see below), whose sum is σ = 26078104728. Its totient is φ = 16716733600.

The previous prime is 20895917113. The next prime is 20895917153. The reversal of 20895917125 is 52171959802.

It can be written as a sum of positive squares in 4 ways, for example, as 3141154116 + 17754763009 = 56046^2 + 133247^2 .

It is not a de Polignac number, because 20895917125 - 2²⁷ = 20761699397 is a prime.

It is a Duffinian number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 83583544 + ... + 83583793.

It is an arithmetic number, because the mean of its divisors is an integer number (3259763091).

Almost surely, 2^20895917125 is an apocalyptic number.

20895917125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20895917125 is a deficient number, since it is larger than the sum of its proper divisors (5182187603).

20895917125 is an equidigital number, since it uses as much as digits as its factorization.

20895917125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167167352 (or 167167342 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 49.

The spelling of 20895917125 in words is "twenty billion, eight hundred ninety-five million, nine hundred seventeen thousand, one hundred twenty-five".