20130457 has 2 divisors, whose sum is σ = 20130458. Its totient is φ = 20130456.

The previous prime is 20130449. The next prime is 20130469. The reversal of 20130457 is 75403102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15555136 + 4575321 = 3944^2 + 2139^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130457 - 2³ = 20130449 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20130757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065228 + 10065229.

It is an arithmetic number, because the mean of its divisors is an integer number (10065229).

Almost surely, 2^20130457 is an apocalyptic number.

It is an amenable number.

20130457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20130457 is an equidigital number, since it uses as much as digits as its factorization.

20130457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20130457 is about 4486.6977834483. The cubic root of 20130457 is about 272.0306743448.

Adding to 20130457 its reverse (75403102), we get a palindrome (95533559).

The spelling of 20130457 in words is "twenty million, one hundred thirty thousand, four hundred fifty-seven".