20440016 has 10 divisors (see below), whose sum is σ = 39602562. Its totient is φ = 10220000.

The previous prime is 20439959. The next prime is 20440039. The reversal of 20440016 is 61004402.

It can be written as a sum of positive squares in only one way, i.e., 19009600 + 1430416 = 4360^2 + 1196^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20439976 and 20440003.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638735 + ... + 638766.

Almost surely, 2^20440016 is an apocalyptic number.

It is an amenable number.

20440016 is a deficient number, since it is larger than the sum of its proper divisors (19162546).

20440016 is a wasteful number, since it uses less digits than its factorization.

20440016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1277509 (or 1277503 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 20440016 is about 4521.0635916784. The cubic root of 20440016 is about 273.4179842246.

Adding to 20440016 its reverse (61004402), we get a palindrome (81444418).

The spelling of 20440016 in words is "twenty million, four hundred forty thousand, sixteen".