20228999 has 8 divisors (see below), whose sum is σ = 23224320. Its totient is φ = 17260056.

The previous prime is 20228993. The next prime is 20229007. The reversal of 20228999 is 99982202.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20228999 - 2⁸ = 20228743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20228993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4919 + ... + 8040.

It is an arithmetic number, because the mean of its divisors is an integer number (2903040).

Almost surely, 2^20228999 is an apocalyptic number.

20228999 is a deficient number, since it is larger than the sum of its proper divisors (2995321).

20228999 is a wasteful number, since it uses less digits than its factorization.

20228999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13189.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 20228999 is about 4497.6659502457. The cubic root of 20228999 is about 272.4738307782.

The spelling of 20228999 in words is "twenty million, two hundred twenty-eight thousand, nine hundred ninety-nine".