20258725 has 6 divisors (see below), whose sum is σ = 25120850. Its totient is φ = 16206960.

The previous prime is 20258663. The next prime is 20258737. The reversal of 20258725 is 52785202.

It can be written as a sum of positive squares in 3 ways, for example, as 349281 + 19909444 = 591^2 + 4462^2 .

It is not a de Polignac number, because 20258725 - 2⁷ = 20258597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 405150 + ... + 405199.

Almost surely, 2^20258725 is an apocalyptic number.

20258725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20258725 is a deficient number, since it is larger than the sum of its proper divisors (4862125).

20258725 is an equidigital number, since it uses as much as digits as its factorization.

20258725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810359 (or 810354 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20258725 is about 4500.9693400422. The cubic root of 20258725 is about 272.6072299142.

The spelling of 20258725 in words is "twenty million, two hundred fifty-eight thousand, seven hundred twenty-five".