20850199 has 4 divisors (see below), whose sum is σ = 21161464. Its totient is φ = 20538936.

The previous prime is 20850169. The next prime is 20850223. The reversal of 20850199 is 99105802.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99105802 = 2 ⋅49552901.

It is a cyclic number.

It is not a de Polignac number, because 20850199 - 2¹³ = 20842007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20850169) 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 3 ways as a sum of consecutive naturals, for example, 155532 + ... + 155665.

It is an arithmetic number, because the mean of its divisors is an integer number (5290366).

Almost surely, 2^20850199 is an apocalyptic number.

20850199 is a deficient number, since it is larger than the sum of its proper divisors (311265).

20850199 is an equidigital number, since it uses as much as digits as its factorization.

20850199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311264.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 20850199 is about 4566.2018133236. The cubic root of 20850199 is about 275.2348363190.

The spelling of 20850199 in words is "twenty million, eight hundred fifty thousand, one hundred ninety-nine".