20040881 has 16 divisors (see below), whose sum is σ = 23654400. Its totient is φ = 16622928.

The previous prime is 20040851. The next prime is 20040887. The reversal of 20040881 is 18804002.

It is not a de Polignac number, because 20040881 - 2⁶ = 20040817 is a prime.

It is a super-2 number, since 2×20040881² = 803273822512322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20040887) 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, 41600 + ... + 42078.

It is an arithmetic number, because the mean of its divisors is an integer number (1478400).

Almost surely, 2^20040881 is an apocalyptic number.

It is an amenable number.

20040881 is a deficient number, since it is larger than the sum of its proper divisors (3613519).

20040881 is a wasteful number, since it uses less digits than its factorization.

20040881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 20040881 is about 4476.7042564815. The cubic root of 20040881 is about 271.6265826332.

Adding to 20040881 its reverse (18804002), we get a palindrome (38844883).

The spelling of 20040881 in words is "twenty million, forty thousand, eight hundred eighty-one".