20404944 has 120 divisors (see below), whose sum is σ = 67471872. Its totient is φ = 5633280.

The previous prime is 20404939. The next prime is 20404949. The reversal of 20404944 is 44940402.

It is an interprime number because it is at equal distance from previous prime (20404939) and next prime (20404949).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30922 + ... + 31574.

Almost surely, 2^20404944 is an apocalyptic number.

20404944 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 20404944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33735936).

20404944 is an abundant number, since it is smaller than the sum of its proper divisors (47066928).

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

20404944 is a wasteful number, since it uses less digits than its factorization.

20404944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 20404944 is about 4517.1831930972. The cubic root of 20404944 is about 273.2615132873.

The spelling of 20404944 in words is "twenty million, four hundred four thousand, nine hundred forty-four".