20217944 has 16 divisors (see below), whose sum is σ = 37957920. Its totient is φ = 10095840.

The previous prime is 20217941. The next prime is 20217949. The reversal of 20217944 is 44971202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20217941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8822 + ... + 10874.

It is an arithmetic number, because the mean of its divisors is an integer number (2372370).

Almost surely, 2^20217944 is an apocalyptic number.

It is an amenable number.

20217944 is a deficient number, since it is larger than the sum of its proper divisors (17739976).

20217944 is a wasteful number, since it uses less digits than its factorization.

20217944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290 (or 3286 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 20217944 is about 4496.4368115209. The cubic root of 20217944 is about 272.4241867485.

The spelling of 20217944 in words is "twenty million, two hundred seventeen thousand, nine hundred forty-four".