20464399 has 4 divisors (see below), whose sum is σ = 20625664. Its totient is φ = 20303136.

The previous prime is 20464391. The next prime is 20464417. The reversal of 20464399 is 99346402.

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

It is a cyclic number.

It is not a de Polignac number, because 20464399 - 2³ = 20464391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20464391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80442 + ... + 80695.

It is an arithmetic number, because the mean of its divisors is an integer number (5156416).

Almost surely, 2^20464399 is an apocalyptic number.

20464399 is a deficient number, since it is larger than the sum of its proper divisors (161265).

20464399 is a wasteful number, since it uses less digits than its factorization.

20464399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161264.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 20464399 is about 4523.7593879427. The cubic root of 20464399 is about 273.5266615943.

The spelling of 20464399 in words is "twenty million, four hundred sixty-four thousand, three hundred ninety-nine".