20808201 has 4 divisors (see below), whose sum is σ = 27744272. Its totient is φ = 13872132.

The previous prime is 20808107. The next prime is 20808233. The reversal of 20808201 is 10280802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-20808201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20808241) 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, 3468031 + ... + 3468036.

It is an arithmetic number, because the mean of its divisors is an integer number (6936068).

Almost surely, 2^20808201 is an apocalyptic number.

It is an amenable number.

20808201 is a deficient number, since it is larger than the sum of its proper divisors (6936071).

20808201 is an equidigital number, since it uses as much as digits as its factorization.

20808201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6936070.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 20808201 is about 4561.6007058926. The cubic root of 20808201 is about 275.0499127033.

The spelling of 20808201 in words is "twenty million, eight hundred eight thousand, two hundred one".