20288223 has 6 divisors (see below), whose sum is σ = 29305224. Its totient is φ = 13525476.

The previous prime is 20288207. The next prime is 20288237. The reversal of 20288223 is 32288202.

It is not a de Polignac number, because 20288223 - 2⁴ = 20288207 is a prime.

It is a super-2 number, since 2×20288223² = 823223984995458, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20288273) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1127115 + ... + 1127132.

It is an arithmetic number, because the mean of its divisors is an integer number (4884204).

Almost surely, 2^20288223 is an apocalyptic number.

20288223 is a deficient number, since it is larger than the sum of its proper divisors (9017001).

20288223 is a wasteful number, since it uses less digits than its factorization.

20288223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254253 (or 2254250 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 20288223 is about 4504.2449977771. The cubic root of 20288223 is about 272.7394769387.

The spelling of 20288223 in words is "twenty million, two hundred eighty-eight thousand, two hundred twenty-three".