20252081 has 4 divisors (see below), whose sum is σ = 21318000. Its totient is φ = 19186164.

The previous prime is 20252077. The next prime is 20252093. The reversal of 20252081 is 18025202.

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 cyclic number.

It is not a de Polignac number, because 20252081 - 2² = 20252077 is a prime.

It is a super-2 number, since 2×20252081² = 820293569661122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20252051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532931 + ... + 532968.

It is an arithmetic number, because the mean of its divisors is an integer number (5329500).

Almost surely, 2^20252081 is an apocalyptic number.

It is an amenable number.

20252081 is a deficient number, since it is larger than the sum of its proper divisors (1065919).

20252081 is a wasteful number, since it uses less digits than its factorization.

20252081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065918.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 20252081 is about 4500.2312162821. The cubic root of 20252081 is about 272.5774254641.

Adding to 20252081 its reverse (18025202), we get a palindrome (38277283).

The spelling of 20252081 in words is "twenty million, two hundred fifty-two thousand, eighty-one".