20000881 has 4 divisors (see below), whose sum is σ = 20225700. Its totient is φ = 19776064.

The previous prime is 20000879. The next prime is 20000909. The reversal of 20000881 is 18800002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7890481 + 12110400 = 2809^2 + 3480^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000881 - 2¹ = 20000879 is a prime.

It is a super-2 number, since 2×20000881² = 800070481552322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000801) 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, 112276 + ... + 112453.

It is an arithmetic number, because the mean of its divisors is an integer number (5056425).

Almost surely, 2^20000881 is an apocalyptic number.

It is an amenable number.

20000881 is a deficient number, since it is larger than the sum of its proper divisors (224819).

20000881 is an equidigital number, since it uses as much as digits as its factorization.

20000881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224818.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 20000881 is about 4472.2344527093. The cubic root of 20000881 is about 271.4457472708.

Adding to 20000881 its reverse (18800002), we get a palindrome (38800883).

The spelling of 20000881 in words is "twenty million, eight hundred eighty-one", and thus it is an aban number.