20363899 has 4 divisors (see below), whose sum is σ = 20424664. Its totient is φ = 20303136.

The previous prime is 20363879. The next prime is 20363911. The reversal of 20363899 is 99836302.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99836302 = 2 ⋅49918151.

It is a cyclic number.

It is not a de Polignac number, because 20363899 - 2⁵ = 20363867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20363879) 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, 29877 + ... + 30550.

It is an arithmetic number, because the mean of its divisors is an integer number (5106166).

Almost surely, 2^20363899 is an apocalyptic number.

20363899 is a deficient number, since it is larger than the sum of its proper divisors (60765).

20363899 is an equidigital number, since it uses as much as digits as its factorization.

20363899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60764.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 20363899 is about 4512.6376987301. The cubic root of 20363899 is about 273.0781664204.

The spelling of 20363899 in words is "twenty million, three hundred sixty-three thousand, eight hundred ninety-nine".