20457211 has 2 divisors, whose sum is σ = 20457212. Its totient is φ = 20457210.

The previous prime is 20457193. The next prime is 20457277. The reversal of 20457211 is 11275402.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20457211 - 2⁹ = 20456699 is a prime.

It is not a weakly prime, because it can be changed into another prime (20457911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10228605 + 10228606.

It is an arithmetic number, because the mean of its divisors is an integer number (10228606).

Almost surely, 2^20457211 is an apocalyptic number.

20457211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20457211 is an equidigital number, since it uses as much as digits as its factorization.

20457211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 20457211 is about 4522.9648462043. The cubic root of 20457211 is about 273.4946329661.

The spelling of 20457211 in words is "twenty million, four hundred fifty-seven thousand, two hundred eleven".