20150257 has 2 divisors, whose sum is σ = 20150258. Its totient is φ = 20150256.

The previous prime is 20150233. The next prime is 20150261. The reversal of 20150257 is 75205102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19368801 + 781456 = 4401^2 + 884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20150257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20150227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10075128 + 10075129.

It is an arithmetic number, because the mean of its divisors is an integer number (10075129).

Almost surely, 2^20150257 is an apocalyptic number.

It is an amenable number.

20150257 is a deficient number, since it is larger than the sum of its proper divisors (1).

20150257 is an equidigital number, since it uses as much as digits as its factorization.

20150257 is an evil number, because the sum of its binary digits is even.

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

The square root of 20150257 is about 4488.9037637267. The cubic root of 20150257 is about 272.1198334796.

Adding to 20150257 its reverse (75205102), we get a palindrome (95355359).

The spelling of 20150257 in words is "twenty million, one hundred fifty thousand, two hundred fifty-seven".