20440020 has 48 divisors (see below), whose sum is σ = 57435840. Its totient is φ = 5431296.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440020 is 2004402.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20439978 and 20440005.

It is a congruent number.

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, 26196 + ... + 26964.

It is an arithmetic number, because the mean of its divisors is an integer number (1196580).

Almost surely, 2^20440020 is an apocalyptic number.

20440020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20440020 is an abundant number, since it is smaller than the sum of its proper divisors (36995820).

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

20440020 is a wasteful number, since it uses less digits than its factorization.

20440020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 1222 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 12.

The square root of 20440020 is about 4521.0640340522. The cubic root of 20440020 is about 273.4180020600.

Adding to 20440020 its reverse (2004402), we get a palindrome (22444422).

The spelling of 20440020 in words is "twenty million, four hundred forty thousand, twenty".