20198105 has 8 divisors (see below), whose sum is σ = 24510600. Its totient is φ = 15976576.

The previous prime is 20198099. The next prime is 20198111. The reversal of 20198105 is 50189102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20198099) and next prime (20198111).

It can be written as a sum of positive squares in 4 ways, for example, as 1466521 + 18731584 = 1211^2 + 4328^2 .

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 20198105 - 2¹⁶ = 20132569 is a prime.

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, 22250 + ... + 23139.

It is an arithmetic number, because the mean of its divisors is an integer number (3063825).

Almost surely, 2^20198105 is an apocalyptic number.

It is an amenable number.

20198105 is a deficient number, since it is larger than the sum of its proper divisors (4312495).

20198105 is an equidigital number, since it uses as much as digits as its factorization.

20198105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45483.

The product of its (nonzero) digits is 720, while the sum is 26.

The square root of 20198105 is about 4494.2301899213. The cubic root of 20198105 is about 272.3350515364.

The spelling of 20198105 in words is "twenty million, one hundred ninety-eight thousand, one hundred five".