20198784 has 64 divisors (see below), whose sum is σ = 56010240. Its totient is φ = 6437376.

The previous prime is 20198779. The next prime is 20198791. The reversal of 20198784 is 48789102.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7689 + ... + 9975.

It is an arithmetic number, because the mean of its divisors is an integer number (875160).

Almost surely, 2^20198784 is an apocalyptic number.

20198784 is a gapful number since it is divisible by the number (24) 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 20198784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28005120).

20198784 is an abundant number, since it is smaller than the sum of its proper divisors (35811456).

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

20198784 is a wasteful number, since it uses less digits than its factorization.

20198784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327 (or 2315 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 20198784 is about 4494.3057305884. The cubic root of 20198784 is about 272.3381031994.

The spelling of 20198784 in words is "twenty million, one hundred ninety-eight thousand, seven hundred eighty-four".