20865099 has 4 divisors (see below), whose sum is σ = 27820136. Its totient is φ = 13910064.

The previous prime is 20865083. The next prime is 20865109. The reversal of 20865099 is 99056802.

It is a happy number.

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

It is not a de Polignac number, because 20865099 - 2⁴ = 20865083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20863099) 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, 3477514 + ... + 3477519.

It is an arithmetic number, because the mean of its divisors is an integer number (6955034).

Almost surely, 2^20865099 is an apocalyptic number.

20865099 is a deficient number, since it is larger than the sum of its proper divisors (6955037).

20865099 is an equidigital number, since it uses as much as digits as its factorization.

20865099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6955036.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 20865099 is about 4567.8330748835. The cubic root of 20865099 is about 275.3003836160.

The spelling of 20865099 in words is "twenty million, eight hundred sixty-five thousand, ninety-nine".