20198285 has 8 divisors (see below), whose sum is σ = 24263160. Its totient is φ = 16141824.

The previous prime is 20198279. The next prime is 20198287. The reversal of 20198285 is 58289102.

It can be written as a sum of positive squares in 4 ways, for example, as 4721929 + 15476356 = 2173^2 + 3934^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20198285 - 2¹⁸ = 19936141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20198287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6089 + ... + 8801.

It is an arithmetic number, because the mean of its divisors is an integer number (3032895).

Almost surely, 2^20198285 is an apocalyptic number.

It is an amenable number.

20198285 is a deficient number, since it is larger than the sum of its proper divisors (4064875).

20198285 is a wasteful number, since it uses less digits than its factorization.

20198285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 20198285 is about 4494.2502155532. The cubic root of 20198285 is about 272.3358605259.

The spelling of 20198285 in words is "twenty million, one hundred ninety-eight thousand, two hundred eighty-five".