20002457 has 2 divisors, whose sum is σ = 20002458. Its totient is φ = 20002456.

The previous prime is 20002453. The next prime is 20002487. The reversal of 20002457 is 75420002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 1990921 = 4244^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002457 - 2² = 20002453 is a prime.

20002457 is a modest number, since divided by 2457 gives 20 as remainder.

It is not a weakly prime, because it can be changed into another prime (20002453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001228 + 10001229.

It is an arithmetic number, because the mean of its divisors is an integer number (10001229).

Almost surely, 2^20002457 is an apocalyptic number.

It is an amenable number.

20002457 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002457 is an equidigital number, since it uses as much as digits as its factorization.

20002457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 20002457 is about 4472.4106475144. The cubic root of 20002457 is about 271.4528767445.

Adding to 20002457 its reverse (75420002), we get a palindrome (95422459).

The spelling of 20002457 in words is "twenty million, two thousand, four hundred fifty-seven".