20806203 has 16 divisors (see below), whose sum is σ = 30431232. Its totient is φ = 12540000.

The previous prime is 20806199. The next prime is 20806207. The reversal of 20806203 is 30260802.

It is an interprime number because it is at equal distance from previous prime (20806199) and next prime (20806207).

It is not a de Polignac number, because 20806203 - 2² = 20806199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20806203.

It is not an unprimeable number, because it can be changed into a prime (20806207) 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, 4653 + ... + 7953.

It is an arithmetic number, because the mean of its divisors is an integer number (1901952).

Almost surely, 2^20806203 is an apocalyptic number.

20806203 is a deficient number, since it is larger than the sum of its proper divisors (9625029).

20806203 is a wasteful number, since it uses less digits than its factorization.

20806203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3506.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 20806203 is about 4561.3816985646. The cubic root of 20806203 is about 275.0411090059.

The spelling of 20806203 in words is "twenty million, eight hundred six thousand, two hundred three".