20198228 has 6 divisors (see below), whose sum is σ = 35346906. Its totient is φ = 10099112.

The previous prime is 20198219. The next prime is 20198231. The reversal of 20198228 is 82289102.

It can be written as a sum of positive squares in only one way, i.e., 20178064 + 20164 = 4492^2 + 142^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20198194 and 20198203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2524775 + ... + 2524782.

It is an arithmetic number, because the mean of its divisors is an integer number (5891151).

Almost surely, 2^20198228 is an apocalyptic number.

It is an amenable number.

20198228 is a deficient number, since it is larger than the sum of its proper divisors (15148678).

20198228 is a wasteful number, since it uses less digits than its factorization.

20198228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049561 (or 5049559 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 20198228 is about 4494.2438741128. The cubic root of 20198228 is about 272.3356043464.

The spelling of 20198228 in words is "twenty million, one hundred ninety-eight thousand, two hundred twenty-eight".