20645444 has 24 divisors (see below), whose sum is σ = 37867200. Its totient is φ = 9830304.

The previous prime is 20645441. The next prime is 20645453. The reversal of 20645444 is 44454602.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20645441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31787 + ... + 32429.

It is an arithmetic number, because the mean of its divisors is an integer number (1577800).

Almost surely, 2^20645444 is an apocalyptic number.

It is an amenable number.

20645444 is a deficient number, since it is larger than the sum of its proper divisors (17221756).

20645444 is a wasteful number, since it uses less digits than its factorization.

20645444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019 (or 1017 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 20645444 is about 4543.7257839795. The cubic root of 20645444 is about 274.3309089198.

The spelling of 20645444 in words is "twenty million, six hundred forty-five thousand, four hundred forty-four".