20099287 has 8 divisors (see below), whose sum is σ = 22918896. Its totient is φ = 17461632.

The previous prime is 20099269. The next prime is 20099311. The reversal of 20099287 is 78299002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20099287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20099267) 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 7 ways as a sum of consecutive naturals, for example, 45253 + ... + 45694.

It is an arithmetic number, because the mean of its divisors is an integer number (2864862).

Almost surely, 2^20099287 is an apocalyptic number.

20099287 is a deficient number, since it is larger than the sum of its proper divisors (2819609).

20099287 is a wasteful number, since it uses less digits than its factorization.

20099287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90977.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 20099287 is about 4483.2228363087. Note that the first 3 decimals coincide. The cubic root of 20099287 is about 271.8901977148.

The spelling of 20099287 in words is "twenty million, ninety-nine thousand, two hundred eighty-seven".