20023885 has 16 divisors (see below), whose sum is σ = 27628416. Its totient is φ = 13647168.

The previous prime is 20023859. The next prime is 20023889. The reversal of 20023885 is 58832002.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20023885 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023889) 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 15 ways as a sum of consecutive naturals, for example, 4402 + ... + 7708.

It is an arithmetic number, because the mean of its divisors is an integer number (1726776).

Almost surely, 2^20023885 is an apocalyptic number.

It is an amenable number.

20023885 is a deficient number, since it is larger than the sum of its proper divisors (7604531).

20023885 is a wasteful number, since it uses less digits than its factorization.

20023885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3492.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 20023885 is about 4474.8055823689. The cubic root of 20023885 is about 271.5497751138.

Adding to 20023885 its reverse (58832002), we get a palindrome (78855887).

The spelling of 20023885 in words is "twenty million, twenty-three thousand, eight hundred eighty-five".