20730219 has 4 divisors (see below), whose sum is σ = 27640296. Its totient is φ = 13820144.

The previous prime is 20730217. The next prime is 20730233. The reversal of 20730219 is 91203702.

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 20730219 - 2¹ = 20730217 is a prime.

It is a super-2 number, since 2×20730219² = 859483959575922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20730217) 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 3 ways as a sum of consecutive naturals, for example, 3455034 + ... + 3455039.

It is an arithmetic number, because the mean of its divisors is an integer number (6910074).

Almost surely, 2^20730219 is an apocalyptic number.

20730219 is a deficient number, since it is larger than the sum of its proper divisors (6910077).

20730219 is an equidigital number, since it uses as much as digits as its factorization.

20730219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6910076.

The product of its (nonzero) digits is 756, while the sum is 24.

The square root of 20730219 is about 4553.0450250354. The cubic root of 20730219 is about 274.7058850025.

The spelling of 20730219 in words is "twenty million, seven hundred thirty thousand, two hundred nineteen".