20023216 has 40 divisors (see below), whose sum is σ = 40287600. Its totient is φ = 9633024.

The previous prime is 20023187. The next prime is 20023259. The reversal of 20023216 is 61232002.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a self number, because there is not a number n which added to its sum of digits gives 20023216.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 88095 + ... + 88321.

It is an arithmetic number, because the mean of its divisors is an integer number (1007190).

Almost surely, 2^20023216 is an apocalyptic number.

It is an amenable number.

20023216 is an abundant number, since it is smaller than the sum of its proper divisors (20264384).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20023216 is a wasteful number, since it uses less digits than its factorization.

20023216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 20023216 is about 4474.7308298936. The cubic root of 20023216 is about 271.5467509118.

Adding to 20023216 its reverse (61232002), we get a palindrome (81255218).

The spelling of 20023216 in words is "twenty million, twenty-three thousand, two hundred sixteen".