20457213 has 16 divisors (see below), whose sum is σ = 31236096. Its totient is φ = 11666160.

The previous prime is 20457211. The next prime is 20457277. The reversal of 20457213 is 31275402.

It is not a de Polignac number, because 20457213 - 2¹ = 20457211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20457211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20148 + ... + 21138.

It is an arithmetic number, because the mean of its divisors is an integer number (1952256).

Almost surely, 2^20457213 is an apocalyptic number.

It is an amenable number.

20457213 is a deficient number, since it is larger than the sum of its proper divisors (10778883).

20457213 is an equidigital number, since it uses as much as digits as its factorization.

20457213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1984.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 20457213 is about 4522.9650672982. The cubic root of 20457213 is about 273.4946418788.

The spelling of 20457213 in words is "twenty million, four hundred fifty-seven thousand, two hundred thirteen".