20818944 has 110 divisors (see below), whose sum is σ = 62417124. Its totient is φ = 6912000.

The previous prime is 20818921. The next prime is 20818961. The reversal of 20818944 is 44981802.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 20818899 and 20818908.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 82819 + ... + 83069.

Almost surely, 2^20818944 is an apocalyptic number.

20818944 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20818944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31208562).

20818944 is an abundant number, since it is smaller than the sum of its proper divisors (41598180).

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

20818944 is an equidigital number, since it uses as much as digits as its factorization.

20818944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283 (or 256 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 20818944 is about 4562.7781011134. The cubic root of 20818944 is about 275.0972394415.

It can be divided in two parts, 2081 and 8944, that added together give a square (11025 = 105²).

The spelling of 20818944 in words is "twenty million, eight hundred eighteen thousand, nine hundred forty-four".