20257090 has 24 divisors (see below), whose sum is σ = 42416892. Its totient is φ = 6945120.

The previous prime is 20257079. The next prime is 20257091. The reversal of 20257090 is 9075202.

It can be written as a sum of positive squares in 2 ways, for example, as 19018321 + 1238769 = 4361^2 + 1113^2 .

It is not an unprimeable number, because it can be changed into a prime (20257091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20181 + ... + 21160.

Almost surely, 2^20257090 is an apocalyptic number.

20257090 is an abundant number, since it is smaller than the sum of its proper divisors (22159802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20257090 is a wasteful number, since it uses less digits than its factorization.

20257090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41362 (or 41355 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 20257090 is about 4500.7877088350. The cubic root of 20257090 is about 272.5998960401.

The spelling of 20257090 in words is "twenty million, two hundred fifty-seven thousand, ninety".