20403944 has 64 divisors (see below), whose sum is σ = 46189440. Its totient is φ = 8335360.

The previous prime is 20403941. The next prime is 20403953. The reversal of 20403944 is 44930402.

It is not an unprimeable number, because it can be changed into a prime (20403941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34112 + ... + 34704.

It is an arithmetic number, because the mean of its divisors is an integer number (721710).

Almost surely, 2^20403944 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 20403944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23094720).

20403944 is an abundant number, since it is smaller than the sum of its proper divisors (25785496).

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

20403944 is a wasteful number, since it uses less digits than its factorization.

20403944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 20403944 is about 4517.0725032924. The cubic root of 20403944 is about 273.2570492388.

The spelling of 20403944 in words is "twenty million, four hundred three thousand, nine hundred forty-four".