20457297 has 24 divisors (see below), whose sum is σ = 33893184. Its totient is φ = 11647584.

The previous prime is 20457277. The next prime is 20457299. The reversal of 20457297 is 79275402.

It is not a de Polignac number, because 20457297 - 2¹¹ = 20455249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20457299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27543 + ... + 28275.

It is an arithmetic number, because the mean of its divisors is an integer number (1412216).

Almost surely, 2^20457297 is an apocalyptic number.

It is an amenable number.

20457297 is a deficient number, since it is larger than the sum of its proper divisors (13435887).

20457297 is a wasteful number, since it uses less digits than its factorization.

20457297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189 (or 1186 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 20457297 is about 4522.9743532326. The cubic root of 20457297 is about 273.4950162133.

The spelling of 20457297 in words is "twenty million, four hundred fifty-seven thousand, two hundred ninety-seven".