20406219 has 8 divisors (see below), whose sum is σ = 27721872. Its totient is φ = 13347360.

The previous prime is 20406167. The next prime is 20406223. The reversal of 20406219 is 91260402.

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

It is not a de Polignac number, because 20406219 - 2⁸ = 20405963 is a prime.

It is a super-2 number, since 2×20406219² = 832827547751922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20406229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64012 + ... + 64329.

It is an arithmetic number, because the mean of its divisors is an integer number (3465234).

Almost surely, 2^20406219 is an apocalyptic number.

20406219 is a deficient number, since it is larger than the sum of its proper divisors (7315653).

20406219 is a wasteful number, since it uses less digits than its factorization.

20406219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128397.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 20406219 is about 4517.3243186648. The cubic root of 20406219 is about 273.2672047376.

The spelling of 20406219 in words is "twenty million, four hundred six thousand, two hundred nineteen".