198020 has 12 divisors (see below), whose sum is σ = 415884. Its totient is φ = 79200.

The previous prime is 198017. The next prime is 198031. The reversal of 198020 is 20891.

It can be written as a sum of positive squares in 2 ways, for example, as 141376 + 56644 = 376^2 + 238^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 9901 = 198020 / (1 + 9 + 8 + 0 + 2 + 0).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 197983 and 198001.

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, 4931 + ... + 4970.

It is an arithmetic number, because the mean of its divisors is an integer number (34657).

2¹⁹⁸⁰²⁰ is an apocalyptic number.

198020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198020 is an abundant number, since it is smaller than the sum of its proper divisors (217864).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198020 is a wasteful number, since it uses less digits than its factorization.

198020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9910 (or 9908 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 198020 is about 444.9943819870. The cubic root of 198020 is about 58.2867292165.

The spelling of 198020 in words is "one hundred ninety-eight thousand, twenty".