20099817 has 12 divisors (see below), whose sum is σ = 29243760. Its totient is φ = 13302648.

The previous prime is 20099801. The next prime is 20099819. The reversal of 20099817 is 71899002.

It is a happy number.

It is not a de Polignac number, because 20099817 - 2⁴ = 20099801 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (20099819) 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 11 ways as a sum of consecutive naturals, for example, 6783 + ... + 9284.

It is an arithmetic number, because the mean of its divisors is an integer number (2436980).

Almost surely, 2^20099817 is an apocalyptic number.

It is an amenable number.

20099817 is a deficient number, since it is larger than the sum of its proper divisors (9143943).

20099817 is a wasteful number, since it uses less digits than its factorization.

20099817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16212 (or 16209 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 20099817 is about 4483.2819451826. The cubic root of 20099817 is about 271.8925875265.

The spelling of 20099817 in words is "twenty million, ninety-nine thousand, eight hundred seventeen".