20040744 has 64 divisors (see below), whose sum is σ = 53568000. Its totient is φ = 6229440.

The previous prime is 20040737. The next prime is 20040781. The reversal of 20040744 is 44704002.

It is a self number, because there is not a number n which added to its sum of digits gives 20040744.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32067 + ... + 32685.

It is an arithmetic number, because the mean of its divisors is an integer number (837000).

Almost surely, 2^20040744 is an apocalyptic number.

20040744 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 20040744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26784000).

20040744 is an abundant number, since it is smaller than the sum of its proper divisors (33527256).

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

20040744 is a wasteful number, since it uses less digits than its factorization.

20040744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 21.

The square root of 20040744 is about 4476.6889550202. The cubic root of 20040744 is about 271.6259636829.

Adding to 20040744 its reverse (44704002), we get a palindrome (64744746).

The spelling of 20040744 in words is "twenty million, forty thousand, seven hundred forty-four".