20191798 has 8 divisors (see below), whose sum is σ = 33041160. Its totient is φ = 9178080.

The previous prime is 20191789. The next prime is 20191799. The reversal of 20191798 is 89719102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20191799) 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 3 ways as a sum of consecutive naturals, for example, 458883 + ... + 458926.

It is an arithmetic number, because the mean of its divisors is an integer number (4130145).

Almost surely, 2^20191798 is an apocalyptic number.

20191798 is a deficient number, since it is larger than the sum of its proper divisors (12849362).

20191798 is a wasteful number, since it uses less digits than its factorization.

20191798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917822.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 20191798 is about 4493.5284576822. The cubic root of 20191798 is about 272.3067024086.

The spelling of 20191798 in words is "twenty million, one hundred ninety-one thousand, seven hundred ninety-eight".