20664222 has 8 divisors (see below), whose sum is σ = 41328456. Its totient is φ = 6888072.

The previous prime is 20664139. The next prime is 20664239. The reversal of 20664222 is 22246602.

It is a sphenic number, since it is the product of 3 distinct primes.

20664222 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 20664192 and 20664201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1722013 + ... + 1722024.

It is an arithmetic number, because the mean of its divisors is an integer number (5166057).

Almost surely, 2^20664222 is an apocalyptic number.

20664222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

20664222 is a wasteful number, since it uses less digits than its factorization.

20664222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3444042.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 20664222 is about 4545.7916802247. The cubic root of 20664222 is about 274.4140559939.

The spelling of 20664222 in words is "twenty million, six hundred sixty-four thousand, two hundred twenty-two".