20258685 has 12 divisors (see below), whose sum is σ = 35115132. Its totient is φ = 10804608.

The previous prime is 20258663. The next prime is 20258737. The reversal of 20258685 is 58685202.

It can be written as a sum of positive squares in 2 ways, for example, as 14584761 + 5673924 = 3819^2 + 2382^2 .

It is not a de Polignac number, because 20258685 - 2⁶ = 20258621 is a prime.

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, 225052 + ... + 225141.

It is an arithmetic number, because the mean of its divisors is an integer number (2926261).

Almost surely, 2^20258685 is an apocalyptic number.

It is an amenable number.

20258685 is a deficient number, since it is larger than the sum of its proper divisors (14856447).

20258685 is a wasteful number, since it uses less digits than its factorization.

20258685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450204 (or 450201 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 20258685 is about 4500.9648965527. The cubic root of 20258685 is about 272.6070504969.

The spelling of 20258685 in words is "twenty million, two hundred fifty-eight thousand, six hundred eighty-five".