20229819 has 4 divisors (see below), whose sum is σ = 26973096. Its totient is φ = 13486544.

The previous prime is 20229799. The next prime is 20229821. The reversal of 20229819 is 91892202.

It is a happy number.

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 20229819 - 2⁸ = 20229563 is a prime.

It is a super-2 number, since 2×20229819² = 818491153545522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20229819.

It is not an unprimeable number, because it can be changed into a prime (20229829) 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, 3371634 + ... + 3371639.

It is an arithmetic number, because the mean of its divisors is an integer number (6743274).

Almost surely, 2^20229819 is an apocalyptic number.

20229819 is a deficient number, since it is larger than the sum of its proper divisors (6743277).

20229819 is an equidigital number, since it uses as much as digits as its factorization.

20229819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6743276.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 20229819 is about 4497.7571077149. The cubic root of 20229819 is about 272.4775123827.

The spelling of 20229819 in words is "twenty million, two hundred twenty-nine thousand, eight hundred nineteen".