20384881 has 16 divisors (see below), whose sum is σ = 23113728. Its totient is φ = 17816400.

The previous prime is 20384879. The next prime is 20384899. The reversal of 20384881 is 18848302.

It is a cyclic number.

It is not a de Polignac number, because 20384881 - 2¹ = 20384879 is a prime.

It is a super-2 number, since 2×20384881² = 831086746768322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20384851) 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, 33280 + ... + 33886.

It is an arithmetic number, because the mean of its divisors is an integer number (1444608).

Almost surely, 2^20384881 is an apocalyptic number.

It is an amenable number.

20384881 is a deficient number, since it is larger than the sum of its proper divisors (2728847).

20384881 is a wasteful number, since it uses less digits than its factorization.

20384881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 20384881 is about 4514.9619046012. The cubic root of 20384881 is about 273.1719231765.

The spelling of 20384881 in words is "twenty million, three hundred eighty-four thousand, eight hundred eighty-one".