20257198 has 32 divisors (see below), whose sum is σ = 34659072. Its totient is φ = 8812800.

The previous prime is 20257169. The next prime is 20257213. The reversal of 20257198 is 89175202.

It is a super-2 number, since 2×20257198² = 820708141622408, which contains 22 as substring.

It is a congruent number.

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 in 15 ways as a sum of consecutive naturals, for example, 32740 + ... + 33352.

It is an arithmetic number, because the mean of its divisors is an integer number (1083096).

Almost surely, 2^20257198 is an apocalyptic number.

20257198 is a deficient number, since it is larger than the sum of its proper divisors (14401874).

20257198 is a wasteful number, since it uses less digits than its factorization.

20257198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 20257198 is about 4500.7997067188. The cubic root of 20257198 is about 272.6003804917.

The spelling of 20257198 in words is "twenty million, two hundred fifty-seven thousand, one hundred ninety-eight".