20229999 has 4 divisors (see below), whose sum is σ = 26973336. Its totient is φ = 13486664.

The previous prime is 20229991. The next prime is 20230031. The reversal of 20229999 is 99992202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20229999 - 2³ = 20229991 is a prime.

20229999 is a modest number, since divided by 9999 gives 2022 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 20229999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20229991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3371664 + ... + 3371669.

It is an arithmetic number, because the mean of its divisors is an integer number (6743334).

Almost surely, 2^20229999 is an apocalyptic number.

20229999 is a deficient number, since it is larger than the sum of its proper divisors (6743337).

20229999 is an equidigital number, since it uses as much as digits as its factorization.

20229999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6743336.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 20229999 is about 4497.7771176438. Note that the first 3 decimals coincide. The cubic root of 20229999 is about 272.4783205265.

It can be divided in two parts, 2022 and 9999, that added together give a palindrome (12021).

The spelling of 20229999 in words is "twenty million, two hundred twenty-nine thousand, nine hundred ninety-nine".