20257242 has 16 divisors (see below), whose sum is σ = 40560480. Its totient is φ = 6744752.

The previous prime is 20257219. The next prime is 20257247. The reversal of 20257242 is 24275202.

It is not an unprimeable number, because it can be changed into a prime (20257247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7009 + ... + 9467.

It is an arithmetic number, because the mean of its divisors is an integer number (2535030).

Almost surely, 2^20257242 is an apocalyptic number.

20257242 is an abundant number, since it is smaller than the sum of its proper divisors (20303238).

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

20257242 is a wasteful number, since it uses less digits than its factorization.

20257242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3837.

The product of its (nonzero) digits is 2240, while the sum is 24.

The square root of 20257242 is about 4500.8045947364. The cubic root of 20257242 is about 272.6005778604.

The spelling of 20257242 in words is "twenty million, two hundred fifty-seven thousand, two hundred forty-two".