20464221 has 4 divisors (see below), whose sum is σ = 27285632. Its totient is φ = 13642812.

The previous prime is 20464217. The next prime is 20464229. The reversal of 20464221 is 12246402.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 20464221 - 2² = 20464217 is a prime.

It is a super-2 number, since 2×20464221² = 837568682273682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20464229) 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, 3410701 + ... + 3410706.

It is an arithmetic number, because the mean of its divisors is an integer number (6821408).

Almost surely, 2^20464221 is an apocalyptic number.

It is an amenable number.

20464221 is a deficient number, since it is larger than the sum of its proper divisors (6821411).

20464221 is an equidigital number, since it uses as much as digits as its factorization.

20464221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6821410.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 20464221 is about 4523.7397139977. The cubic root of 20464221 is about 273.5258685441.

The spelling of 20464221 in words is "twenty million, four hundred sixty-four thousand, two hundred twenty-one".