20440044 has 18 divisors (see below), whose sum is σ = 51667980. Its totient is φ = 6813336.

The previous prime is 20440039. The next prime is 20440109. The reversal of 20440044 is 44004402.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 20439999 and 20440026.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 283854 + ... + 283925.

Almost surely, 2^20440044 is an apocalyptic number.

It is an amenable number.

20440044 is an abundant number, since it is smaller than the sum of its proper divisors (31227936).

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

20440044 is a wasteful number, since it uses less digits than its factorization.

20440044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567789 (or 567784 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 20440044 is about 4521.0666882938. The cubic root of 20440044 is about 273.4181090728.

Adding to 20440044 its reverse (44004402), we get a palindrome (64444446).

The spelling of 20440044 in words is "twenty million, four hundred forty thousand, forty-four".