20999198 has 8 divisors (see below), whose sum is σ = 34362360. Its totient is φ = 9545080.

The previous prime is 20999197. The next prime is 20999203. The reversal of 20999198 is 89199902.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20999191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477233 + ... + 477276.

It is an arithmetic number, because the mean of its divisors is an integer number (4295295).

Almost surely, 2^20999198 is an apocalyptic number.

20999198 is a deficient number, since it is larger than the sum of its proper divisors (13363162).

20999198 is a wasteful number, since it uses less digits than its factorization.

20999198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 954522.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 20999198 is about 4582.4881887464. The cubic root of 20999198 is about 275.8889054391. Note that the first 3 decimals are identical.

The spelling of 20999198 in words is "twenty million, nine hundred ninety-nine thousand, one hundred ninety-eight".