20057281 has 2 divisors, whose sum is σ = 20057282. Its totient is φ = 20057280.

The previous prime is 20057269. The next prime is 20057291. The reversal of 20057281 is 18275002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13727025 + 6330256 = 3705^2 + 2516^2 .

It is a cyclic number.

It is not a de Polignac number, because 20057281 - 2⁵ = 20057249 is a prime.

It is a super-2 number, since 2×20057281² = 804589042225922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20057291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10028640 + 10028641.

It is an arithmetic number, because the mean of its divisors is an integer number (10028641).

Almost surely, 2^20057281 is an apocalyptic number.

It is an amenable number.

20057281 is a deficient number, since it is larger than the sum of its proper divisors (1).

20057281 is an equidigital number, since it uses as much as digits as its factorization.

20057281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 20057281 is about 4478.5355865506. The cubic root of 20057281 is about 271.7006555807.

The spelling of 20057281 in words is "twenty million, fifty-seven thousand, two hundred eighty-one".