20199897 has 24 divisors (see below), whose sum is σ = 29949920. Its totient is φ = 13115520.

The previous prime is 20199847. The next prime is 20199901. The reversal of 20199897 is 79899102.

It is not a de Polignac number, because 20199897 - 2⁷ = 20199769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20199847) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 83697 + ... + 83937.

Almost surely, 2^20199897 is an apocalyptic number.

It is an amenable number.

20199897 is a deficient number, since it is larger than the sum of its proper divisors (9750023).

20199897 is a wasteful number, since it uses less digits than its factorization.

20199897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 20199897 is about 4494.4295522346. The cubic root of 20199897 is about 272.3431052619.

The spelling of 20199897 in words is "twenty million, one hundred ninety-nine thousand, eight hundred ninety-seven".