20233257 has 24 divisors (see below), whose sum is σ = 29940960. Its totient is φ = 12144000.

The previous prime is 20233249. The next prime is 20233289. The reversal of 20233257 is 75233202.

It is not a de Polignac number, because 20233257 - 2³ = 20233249 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20233207) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50257 + ... + 50657.

It is an arithmetic number, because the mean of its divisors is an integer number (1247540).

Almost surely, 2^20233257 is an apocalyptic number.

It is an amenable number.

20233257 is a deficient number, since it is larger than the sum of its proper divisors (9707703).

20233257 is a wasteful number, since it uses less digits than its factorization.

20233257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 24.

The square root of 20233257 is about 4498.1392819698. The cubic root of 20233257 is about 272.4929471002.

Adding to 20233257 its reverse (75233202), we get a palindrome (95466459).

Subtracting 20233257 from its reverse (75233202), we obtain a palindrome (54999945).

The spelling of 20233257 in words is "twenty million, two hundred thirty-three thousand, two hundred fifty-seven".