20801223 has 18 divisors (see below), whose sum is σ = 31451784. Its totient is φ = 13222704.

The previous prime is 20801191. The next prime is 20801243. The reversal of 20801223 is 32210802.

It is a happy number.

It is not a de Polignac number, because 20801223 - 2⁵ = 20801191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20801196 and 20801205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20801243) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 65461 + ... + 65777.

Almost surely, 2^20801223 is an apocalyptic number.

20801223 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20801223 is a deficient number, since it is larger than the sum of its proper divisors (10650561).

20801223 is an equidigital number, since it uses as much as digits as its factorization.

20801223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 343 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 20801223 is about 4560.8357786704. The cubic root of 20801223 is about 275.0191634029.

The spelling of 20801223 in words is "twenty million, eight hundred one thousand, two hundred twenty-three".