20057251 has 4 divisors (see below), whose sum is σ = 20067400. Its totient is φ = 20047104.

The previous prime is 20057249. The next prime is 20057269. The reversal of 20057251 is 15275002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20057251 - 2¹ = 20057249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20057281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041 + ... + 6418.

It is an arithmetic number, because the mean of its divisors is an integer number (5016850).

Almost surely, 2^20057251 is an apocalyptic number.

20057251 is a deficient number, since it is larger than the sum of its proper divisors (10149).

20057251 is an equidigital number, since it uses as much as digits as its factorization.

20057251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10148.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 20057251 is about 4478.5322372402. The cubic root of 20057251 is about 271.7005201183.

The spelling of 20057251 in words is "twenty million, fifty-seven thousand, two hundred fifty-one".