20855519 has 2 divisors, whose sum is σ = 20855520. Its totient is φ = 20855518.

The previous prime is 20855501. The next prime is 20855537. The reversal of 20855519 is 91555802.

It is a balanced prime because it is at equal distance from previous prime (20855501) and next prime (20855537).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20855519 is a prime.

It is a super-2 number, since 2×20855519² = 869905345518722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20815519) 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 as a sum of consecutive naturals, namely, 10427759 + 10427760.

It is an arithmetic number, because the mean of its divisors is an integer number (10427760).

Almost surely, 2^20855519 is an apocalyptic number.

20855519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20855519 is an equidigital number, since it uses as much as digits as its factorization.

20855519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 35.

The square root of 20855519 is about 4566.7843172193. The cubic root of 20855519 is about 275.2582433667.

The spelling of 20855519 in words is "twenty million, eight hundred fifty-five thousand, five hundred nineteen".