20208081 has 4 divisors (see below), whose sum is σ = 26944112. Its totient is φ = 13472052.

The previous prime is 20208061. The next prime is 20208101. The reversal of 20208081 is 18080202.

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 an interprime number because it is at equal distance from previous prime (20208061) and next prime (20208101).

It is not a de Polignac number, because 20208081 - 2⁵ = 20208049 is a prime.

It is a super-2 number, since 2×20208081² = 816733075405122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20208061) 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, 3368011 + ... + 3368016.

It is an arithmetic number, because the mean of its divisors is an integer number (6736028).

Almost surely, 2^20208081 is an apocalyptic number.

It is an amenable number.

20208081 is a deficient number, since it is larger than the sum of its proper divisors (6736031).

20208081 is an equidigital number, since it uses as much as digits as its factorization.

20208081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6736030.

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

The square root of 20208081 is about 4495.3399204065. The cubic root of 20208081 is about 272.3798802850.

Adding to 20208081 its reverse (18080202), we get a palindrome (38288283).

It can be divided in two parts, 2020 and 8081, that added together give a palindrome (10101).

The spelling of 20208081 in words is "twenty million, two hundred eight thousand, eighty-one".