20022644 has 24 divisors (see below), whose sum is σ = 36628200. Its totient is φ = 9564800.

The previous prime is 20022631. The next prime is 20022677. The reversal of 20022644 is 44622002.

It can be written as a sum of positive squares in 4 ways, for example, as 5107600 + 14915044 = 2260^2 + 3862^2 .

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, 10862 + ... + 12570.

It is an arithmetic number, because the mean of its divisors is an integer number (1526175).

Almost surely, 2^20022644 is an apocalyptic number.

It is an amenable number.

20022644 is a deficient number, since it is larger than the sum of its proper divisors (16605556).

20022644 is a wasteful number, since it uses less digits than its factorization.

20022644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843 (or 1841 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20022644 is about 4474.6669149781. Note that the first 3 decimals coincide. The cubic root of 20022644 is about 271.5441651430.

Adding to 20022644 its reverse (44622002), we get a palindrome (64644646).

The spelling of 20022644 in words is "twenty million, twenty-two thousand, six hundred forty-four".