20898199 has 4 divisors (see below), whose sum is σ = 23883664. Its totient is φ = 17912736.

The previous prime is 20898197. The next prime is 20898203. The reversal of 20898199 is 99189802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20898199 - 2¹ = 20898197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20898193) 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, 1492722 + ... + 1492735.

It is an arithmetic number, because the mean of its divisors is an integer number (5970916).

Almost surely, 2^20898199 is an apocalyptic number.

20898199 is a deficient number, since it is larger than the sum of its proper divisors (2985465).

20898199 is an equidigital number, since it uses as much as digits as its factorization.

20898199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985464.

The product of its (nonzero) digits is 93312, while the sum is 46.

The square root of 20898199 is about 4571.4548012640. The cubic root of 20898199 is about 275.4458838177.

The spelling of 20898199 in words is "twenty million, eight hundred ninety-eight thousand, one hundred ninety-nine".