20582257 has 16 divisors (see below), whose sum is σ = 22861440. Its totient is φ = 18441472.

The previous prime is 20582227. The next prime is 20582273. The reversal of 20582257 is 75228502.

It is a cyclic number.

It is not a de Polignac number, because 20582257 - 2⁷ = 20582129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20582207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40668 + ... + 41170.

It is an arithmetic number, because the mean of its divisors is an integer number (1428840).

Almost surely, 2^20582257 is an apocalyptic number.

It is an amenable number.

20582257 is a deficient number, since it is larger than the sum of its proper divisors (2279183).

20582257 is a wasteful number, since it uses less digits than its factorization.

20582257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 20582257 is about 4536.7672411090. The cubic root of 20582257 is about 274.0507524932.

The spelling of 20582257 in words is "twenty million, five hundred eighty-two thousand, two hundred fifty-seven".