20019798 has 64 divisors (see below), whose sum is σ = 47232000. Its totient is φ = 6351048.

The previous prime is 20019781. The next prime is 20019817. The reversal of 20019798 is 89791002.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100503 + ... + 100701.

It is an arithmetic number, because the mean of its divisors is an integer number (738000).

Almost surely, 2^20019798 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20019798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23616000).

20019798 is an abundant number, since it is smaller than the sum of its proper divisors (27212202).

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

20019798 is an equidigital number, since it uses as much as digits as its factorization.

20019798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 20019798 is about 4474.3488911796. The cubic root of 20019798 is about 271.5312988550.

The spelling of 20019798 in words is "twenty million, nineteen thousand, seven hundred ninety-eight".