20520219 has 4 divisors (see below), whose sum is σ = 27360296. Its totient is φ = 13680144.

The previous prime is 20520211. The next prime is 20520221. The reversal of 20520219 is 91202502.

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

It is not a de Polignac number, because 20520219 - 2³ = 20520211 is a prime.

It is a super-2 number, since 2×20520219² = 842158775615922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20520195 and 20520204.

It is not an unprimeable number, because it can be changed into a prime (20520211) 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, 3420034 + ... + 3420039.

It is an arithmetic number, because the mean of its divisors is an integer number (6840074).

Almost surely, 2^20520219 is an apocalyptic number.

20520219 is a deficient number, since it is larger than the sum of its proper divisors (6840077).

20520219 is an equidigital number, since it uses as much as digits as its factorization.

20520219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6840076.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 20520219 is about 4529.9248338135. The cubic root of 20520219 is about 273.7751320727.

The spelling of 20520219 in words is "twenty million, five hundred twenty thousand, two hundred nineteen".