20457233 has 4 divisors (see below), whose sum is σ = 20482740. Its totient is φ = 20431728.

The previous prime is 20457211. The next prime is 20457277. The reversal of 20457233 is 33275402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14807104 + 5650129 = 3848^2 + 2377^2 .

It is a cyclic number.

It is not a de Polignac number, because 20457233 - 2¹⁰ = 20456209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20457133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11510 + ... + 13167.

It is an arithmetic number, because the mean of its divisors is an integer number (5120685).

Almost surely, 2^20457233 is an apocalyptic number.

It is an amenable number.

20457233 is a deficient number, since it is larger than the sum of its proper divisors (25507).

20457233 is an equidigital number, since it uses as much as digits as its factorization.

20457233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25506.

The product of its (nonzero) digits is 5040, while the sum is 26.

The square root of 20457233 is about 4522.9672782367. The cubic root of 20457233 is about 273.4947310062.

The spelling of 20457233 in words is "twenty million, four hundred fifty-seven thousand, two hundred thirty-three".