20564198 has 8 divisors (see below), whose sum is σ = 31352160. Its totient is φ = 10113480.

The previous prime is 20564189. The next prime is 20564207. The reversal of 20564198 is 89146502.

It is an interprime number because it is at equal distance from previous prime (20564189) and next prime (20564207).

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 84158 + ... + 84401.

It is an arithmetic number, because the mean of its divisors is an integer number (3919020).

Almost surely, 2^20564198 is an apocalyptic number.

20564198 is a deficient number, since it is larger than the sum of its proper divisors (10787962).

20564198 is a wasteful number, since it uses less digits than its factorization.

20564198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168622.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20564198 is about 4534.7765104799. The cubic root of 20564198 is about 273.9705777632.

The spelling of 20564198 in words is "twenty million, five hundred sixty-four thousand, one hundred ninety-eight".