20155925 has 12 divisors (see below), whose sum is σ = 25404996. Its totient is φ = 15859200.

The previous prime is 20155913. The next prime is 20155951. The reversal of 20155925 is 52955102.

It can be written as a sum of positive squares in 6 ways, for example, as 4490161 + 15665764 = 2119^2 + 3958^2 .

It is not a de Polignac number, because 20155925 - 2⁴ = 20155909 is a prime.

It is a super-2 number, since 2×20155925² = 812522625211250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5084 + ... + 8133.

It is an arithmetic number, because the mean of its divisors is an integer number (2117083).

Almost surely, 2^20155925 is an apocalyptic number.

20155925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20155925 is a deficient number, since it is larger than the sum of its proper divisors (5249071).

20155925 is a wasteful number, since it uses less digits than its factorization.

20155925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13288 (or 13283 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 20155925 is about 4489.5350538781. The cubic root of 20155925 is about 272.1453456542.

The spelling of 20155925 in words is "twenty million, one hundred fifty-five thousand, nine hundred twenty-five".