20021798 has 8 divisors (see below), whose sum is σ = 30158040. Its totient is φ = 9969120.

The previous prime is 20021759. The next prime is 20021821. The reversal of 20021798 is 89712002.

It is a happy number.

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

It is a self number, because there is not a number n which added to its sum of digits gives 20021798.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20288 + ... + 21251.

It is an arithmetic number, because the mean of its divisors is an integer number (3769755).

Almost surely, 2^20021798 is an apocalyptic number.

20021798 is a deficient number, since it is larger than the sum of its proper divisors (10136242).

20021798 is a wasteful number, since it uses less digits than its factorization.

20021798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41782.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 20021798 is about 4474.5723818037. The cubic root of 20021798 is about 271.5403406464.

The spelling of 20021798 in words is "twenty million, twenty-one thousand, seven hundred ninety-eight".