20439916 has 48 divisors (see below), whose sum is σ = 45190656. Its totient is φ = 7881984.

The previous prime is 20439911. The next prime is 20439917. The reversal of 20439916 is 61993402.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (20439911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10015 + ... + 11881.

It is an arithmetic number, because the mean of its divisors is an integer number (941472).

Almost surely, 2^20439916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20439916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22595328).

20439916 is an abundant number, since it is smaller than the sum of its proper divisors (24750740).

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

20439916 is a wasteful number, since it uses less digits than its factorization.

20439916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918 (or 1916 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20439916 is about 4521.0525323203. The cubic root of 20439916 is about 273.4175383371.

The spelling of 20439916 in words is "twenty million, four hundred thirty-nine thousand, nine hundred sixteen".