20422644 has 96 divisors (see below), whose sum is σ = 58060800. Its totient is φ = 5506560.

The previous prime is 20422637. The next prime is 20422651. The reversal of 20422644 is 44622402.

It is an interprime number because it is at equal distance from previous prime (20422637) and next prime (20422651).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42397 + ... + 42875.

It is an arithmetic number, because the mean of its divisors is an integer number (604800).

Almost surely, 2^20422644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20422644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29030400).

20422644 is an abundant number, since it is smaller than the sum of its proper divisors (37638156).

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

20422644 is a wasteful number, since it uses less digits than its factorization.

20422644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533 (or 531 counting only the distinct ones).

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

The square root of 20422644 is about 4519.1419539554. The cubic root of 20422644 is about 273.3405028194.

The spelling of 20422644 in words is "twenty million, four hundred twenty-two thousand, six hundred forty-four".