20440004 has 12 divisors (see below), whose sum is σ = 38521644. Its totient is φ = 9433824.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440004 is 40004402.

It can be written as a sum of positive squares in 2 ways, for example, as 2715904 + 17724100 = 1648^2 + 4210^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196487 + ... + 196590.

It is an arithmetic number, because the mean of its divisors is an integer number (3210137).

Almost surely, 2^20440004 is an apocalyptic number.

It is an amenable number.

20440004 is a deficient number, since it is larger than the sum of its proper divisors (18081640).

20440004 is a wasteful number, since it uses less digits than its factorization.

20440004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393094 (or 393092 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 20440004 is about 4521.0622645569. The cubic root of 20440004 is about 273.4179307181.

Adding to 20440004 its reverse (40004402), we get a palindrome (60444406).

The spelling of 20440004 in words is "twenty million, four hundred forty thousand, four".