20838881 has 16 divisors (see below), whose sum is σ = 24879360. Its totient is φ = 17081280.

The previous prime is 20838871. The next prime is 20838919. The reversal of 20838881 is 18883802.

It is a cyclic number.

It is not a de Polignac number, because 20838881 - 2¹⁸ = 20576737 is a prime.

It is a super-2 number, since 2×20838881² = 868517922664322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20838841) 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, 15140 + ... + 16458.

It is an arithmetic number, because the mean of its divisors is an integer number (1554960).

Almost surely, 2^20838881 is an apocalyptic number.

It is an amenable number.

20838881 is a deficient number, since it is larger than the sum of its proper divisors (4040479).

20838881 is a wasteful number, since it uses less digits than its factorization.

20838881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 24576, while the sum is 38.

The square root of 20838881 is about 4564.9623218598. The cubic root of 20838881 is about 275.1850258959.

The spelling of 20838881 in words is "twenty million, eight hundred thirty-eight thousand, eight hundred eighty-one".