20286399 has 16 divisors (see below), whose sum is σ = 31979520. Its totient is φ = 11192160.

The previous prime is 20286379. The next prime is 20286401. The reversal of 20286399 is 99368202.

It is not a de Polignac number, because 20286399 - 2⁵ = 20286367 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20286359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16047 + ... + 17264.

It is an arithmetic number, because the mean of its divisors is an integer number (1998720).

Almost surely, 2^20286399 is an apocalyptic number.

20286399 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

20286399 is a deficient number, since it is larger than the sum of its proper divisors (11693121).

20286399 is a wasteful number, since it uses less digits than its factorization.

20286399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33350.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20286399 is about 4504.0425175613. The cubic root of 20286399 is about 272.7313032031.

The spelling of 20286399 in words is "twenty million, two hundred eighty-six thousand, three hundred ninety-nine".