20198187 has 16 divisors (see below), whose sum is σ = 29992480. Its totient is φ = 13434336.

The previous prime is 20198183. The next prime is 20198201. The reversal of 20198187 is 78189102.

It is not a de Polignac number, because 20198187 - 2² = 20198183 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20198183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22593 + ... + 23469.

It is an arithmetic number, because the mean of its divisors is an integer number (1874530).

Almost surely, 2^20198187 is an apocalyptic number.

20198187 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

20198187 is a deficient number, since it is larger than the sum of its proper divisors (9794293).

20198187 is an equidigital number, since it uses as much as digits as its factorization.

20198187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739 (or 1733 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 20198187 is about 4494.2393127202. The cubic root of 20198187 is about 272.3354200767.

The spelling of 20198187 in words is "twenty million, one hundred ninety-eight thousand, one hundred eighty-seven".