20898188 has 6 divisors (see below), whose sum is σ = 36571836. Its totient is φ = 10449092.

The previous prime is 20898169. The next prime is 20898193. The reversal of 20898188 is 88189802.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2612270 + ... + 2612277.

It is an arithmetic number, because the mean of its divisors is an integer number (6095306).

Almost surely, 2^20898188 is an apocalyptic number.

It is an amenable number.

20898188 is a deficient number, since it is larger than the sum of its proper divisors (15673648).

20898188 is a wasteful number, since it uses less digits than its factorization.

20898188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5224551 (or 5224549 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 44.

The square root of 20898188 is about 4571.4535981458. The cubic root of 20898188 is about 275.4458354897.

The spelling of 20898188 in words is "twenty million, eight hundred ninety-eight thousand, one hundred eighty-eight".