20198895 has 8 divisors (see below), whose sum is σ = 32318256. Its totient is φ = 10772736.

The previous prime is 20198837. The next prime is 20198903. The reversal of 20198895 is 59889102.

It is a happy number.

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

It is not a de Polignac number, because 20198895 - 2⁶ = 20198831 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673282 + ... + 673311.

It is an arithmetic number, because the mean of its divisors is an integer number (4039782).

Almost surely, 2^20198895 is an apocalyptic number.

20198895 is a deficient number, since it is larger than the sum of its proper divisors (12119361).

20198895 is a wasteful number, since it uses less digits than its factorization.

20198895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346601.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 20198895 is about 4494.3180795311. The cubic root of 20198895 is about 272.3386020656.

The spelling of 20198895 in words is "twenty million, one hundred ninety-eight thousand, eight hundred ninety-five".