20398896 has 150 divisors (see below), whose sum is σ = 67728180. Its totient is φ = 5729472.

The previous prime is 20398891. The next prime is 20398897. The reversal of 20398896 is 69889302.

It is a super-2 number, since 2×20398896² = 832229916037632, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20398891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 345715 + ... + 345773.

Almost surely, 2^20398896 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 20398896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33864090).

20398896 is an abundant number, since it is smaller than the sum of its proper divisors (47329284).

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

20398896 is an equidigital number, since it uses as much as digits as its factorization.

20398896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 20398896 is about 4516.5136997467. The cubic root of 20398896 is about 273.2345124953.

It can be divided in two parts, 203 and 98896, that added together give a palindrome (99099).

The spelling of 20398896 in words is "twenty million, three hundred ninety-eight thousand, eight hundred ninety-six".