20258240 has 112 divisors (see below), whose sum is σ = 52120800. Its totient is φ = 7483392.

The previous prime is 20258213. The next prime is 20258261. The reversal of 20258240 is 4285202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343331 + ... + 343389.

Almost surely, 2^20258240 is an apocalyptic number.

20258240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20258240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26060400).

20258240 is an abundant number, since it is smaller than the sum of its proper divisors (31862560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20258240 is a wasteful number, since it uses less digits than its factorization.

20258240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 20258240 is about 4500.9154624365. The cubic root of 20258240 is about 272.6050544637.

The spelling of 20258240 in words is "twenty million, two hundred fifty-eight thousand, two hundred forty".