20228664 has 32 divisors (see below), whose sum is σ = 50688000. Its totient is φ = 6727392.

The previous prime is 20228653. The next prime is 20228683. The reversal of 20228664 is 46682202.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 15177 + ... + 16455.

It is an arithmetic number, because the mean of its divisors is an integer number (1584000).

Almost surely, 2^20228664 is an apocalyptic number.

20228664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

20228664 is an abundant number, since it is smaller than the sum of its proper divisors (30459336).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20228664 is a wasteful number, since it uses less digits than its factorization.

20228664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947 (or 1943 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 20228664 is about 4497.6287085530. The cubic root of 20228664 is about 272.4723266794.

The spelling of 20228664 in words is "twenty million, two hundred twenty-eight thousand, six hundred sixty-four".