20985044 has 24 divisors (see below), whose sum is σ = 39211200. Its totient is φ = 9797760.

The previous prime is 20985017. The next prime is 20985049. The reversal of 20985044 is 44058902.

It is a self number, because there is not a number n which added to its sum of digits gives 20985044.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20985049) 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, 3452 + ... + 7340.

It is an arithmetic number, because the mean of its divisors is an integer number (1633800).

Almost surely, 2^20985044 is an apocalyptic number.

It is an amenable number.

20985044 is a deficient number, since it is larger than the sum of its proper divisors (18226156).

20985044 is a wasteful number, since it uses less digits than its factorization.

20985044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3983 (or 3981 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 20985044 is about 4580.9435709251. The cubic root of 20985044 is about 275.8269060993.

The spelling of 20985044 in words is "twenty million, nine hundred eighty-five thousand, forty-four".