20464391 has 2 divisors, whose sum is σ = 20464392. Its totient is φ = 20464390.

The previous prime is 20464373. The next prime is 20464417. The reversal of 20464391 is 19346402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20464391 - 2¹⁰ = 20463367 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20464321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10232195 + 10232196.

It is an arithmetic number, because the mean of its divisors is an integer number (10232196).

Almost surely, 2^20464391 is an apocalyptic number.

20464391 is a deficient number, since it is larger than the sum of its proper divisors (1).

20464391 is an equidigital number, since it uses as much as digits as its factorization.

20464391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 20464391 is about 4523.7585037223. The cubic root of 20464391 is about 273.5266259517.

The spelling of 20464391 in words is "twenty million, four hundred sixty-four thousand, three hundred ninety-one".