20440036 has 12 divisors (see below), whose sum is σ = 36924160. Its totient is φ = 9890280.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440036 is 63004402.

It is a junction number, because it is equal to n+sod(n) for n = 20439995 and 20440022.

It is not an unprimeable number, because it can be changed into a prime (20440039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82296 + ... + 82543.

Almost surely, 2^20440036 is an apocalyptic number.

It is an amenable number.

20440036 is a deficient number, since it is larger than the sum of its proper divisors (16484124).

20440036 is a wasteful number, since it uses less digits than its factorization.

20440036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164874 (or 164872 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 20440036 is about 4521.0658035468. The cubic root of 20440036 is about 273.4180734019.

Adding to 20440036 its reverse (63004402), we get a palindrome (83444438).

The spelling of 20440036 in words is "twenty million, four hundred forty thousand, thirty-six".