20130257 has 8 divisors (see below), whose sum is σ = 23628096. Its totient is φ = 16787952.

The previous prime is 20130251. The next prime is 20130281. The reversal of 20130257 is 75203102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20130257 - 2⁸ = 20130001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20130251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38603 + ... + 39120.

It is an arithmetic number, because the mean of its divisors is an integer number (2953512).

Almost surely, 2^20130257 is an apocalyptic number.

It is an amenable number.

20130257 is a deficient number, since it is larger than the sum of its proper divisors (3497839).

20130257 is an equidigital number, since it uses as much as digits as its factorization.

20130257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77767.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 20130257 is about 4486.6754952860. The cubic root of 20130257 is about 272.0297734493.

Adding to 20130257 its reverse (75203102), we get a palindrome (95333359).

The spelling of 20130257 in words is "twenty million, one hundred thirty thousand, two hundred fifty-seven".