20417320 has 96 divisors (see below), whose sum is σ = 58358880. Its totient is φ = 6357120.

The previous prime is 20417281. The next prime is 20417329. The reversal of 20417320 is 2371402.

It is not an unprimeable number, because it can be changed into a prime (20417329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21087 + ... + 22033.

It is an arithmetic number, because the mean of its divisors is an integer number (607905).

Almost surely, 2^20417320 is an apocalyptic number.

20417320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20417320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29179440).

20417320 is an abundant number, since it is smaller than the sum of its proper divisors (37941560).

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

20417320 is a wasteful number, since it uses less digits than its factorization.

20417320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983 (or 972 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 20417320 is about 4518.5528656861. The cubic root of 20417320 is about 273.3167482831.

Adding to 20417320 its reverse (2371402), we get a palindrome (22788722).

The spelling of 20417320 in words is "twenty million, four hundred seventeen thousand, three hundred twenty".