20644422 has 16 divisors (see below), whose sum is σ = 41655600. Its totient is φ = 6820352.

The previous prime is 20644399. The next prime is 20644447. The reversal of 20644422 is 22444602.

It is a junction number, because it is equal to n+sod(n) for n = 20644392 and 20644401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14547 + ... + 15902.

It is an arithmetic number, because the mean of its divisors is an integer number (2603475).

Almost surely, 2^20644422 is an apocalyptic number.

20644422 is an abundant number, since it is smaller than the sum of its proper divisors (21011178).

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

20644422 is a wasteful number, since it uses less digits than its factorization.

20644422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30567.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 20644422 is about 4543.6133198150. The cubic root of 20644422 is about 274.3263821613.

The spelling of 20644422 in words is "twenty million, six hundred forty-four thousand, four hundred twenty-two".