20257572 has 48 divisors (see below), whose sum is σ = 51932160. Its totient is φ = 6117408.

The previous prime is 20257547. The next prime is 20257597. The reversal of 20257572 is 27575202.

It is an interprime number because it is at equal distance from previous prime (20257547) and next prime (20257597).

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, 3313 + ... + 7175.

It is an arithmetic number, because the mean of its divisors is an integer number (1081920).

Almost surely, 2^20257572 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20257572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25966080).

20257572 is an abundant number, since it is smaller than the sum of its proper divisors (31674588).

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

20257572 is a wasteful number, since it uses less digits than its factorization.

20257572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912 (or 3910 counting only the distinct ones).

The product of its (nonzero) digits is 9800, while the sum is 30.

The square root of 20257572 is about 4500.8412546989. The cubic root of 20257572 is about 272.6020581162.

The spelling of 20257572 in words is "twenty million, two hundred fifty-seven thousand, five hundred seventy-two".