20810944 has 112 divisors (see below), whose sum is σ = 53254656. Its totient is φ = 7833600.

The previous prime is 20810897. The next prime is 20810981. The reversal of 20810944 is 44901802.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×20810944² = 866190780342272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 15 ways as a sum of consecutive naturals, for example, 201997 + ... + 202099.

It is an arithmetic number, because the mean of its divisors is an integer number (475488).

Almost surely, 2^20810944 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 20810944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26627328).

20810944 is an abundant number, since it is smaller than the sum of its proper divisors (32443712).

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

20810944 is a wasteful number, since it uses less digits than its factorization.

20810944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174 (or 164 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20810944 is about 4561.9013579866. The cubic root of 20810944 is about 275.0619981428.

The spelling of 20810944 in words is "twenty million, eight hundred ten thousand, nine hundred forty-four".