20156219 has 2 divisors, whose sum is σ = 20156220. Its totient is φ = 20156218.

The previous prime is 20156183. The next prime is 20156243. The reversal of 20156219 is 91265102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20156219 - 2²⁴ = 3379003 is a prime.

It is a super-2 number, since 2×20156219² = 812546328751922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20156299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10078109 + 10078110.

It is an arithmetic number, because the mean of its divisors is an integer number (10078110).

Almost surely, 2^20156219 is an apocalyptic number.

20156219 is a deficient number, since it is larger than the sum of its proper divisors (1).

20156219 is an equidigital number, since it uses as much as digits as its factorization.

20156219 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 20156219 is about 4489.5677965702. The cubic root of 20156219 is about 272.1466688440.

The spelling of 20156219 in words is "twenty million, one hundred fifty-six thousand, two hundred nineteen".