20974519 has 2 divisors, whose sum is σ = 20974520. Its totient is φ = 20974518.

The previous prime is 20974501. The next prime is 20974531. The reversal of 20974519 is 91547902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20974519 - 2⁵ = 20974487 is a prime.

It is a super-2 number, since 2×20974519² = 879860894562722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20974589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10487259 + 10487260.

It is an arithmetic number, because the mean of its divisors is an integer number (10487260).

Almost surely, 2^20974519 is an apocalyptic number.

20974519 is a deficient number, since it is larger than the sum of its proper divisors (1).

20974519 is an equidigital number, since it uses as much as digits as its factorization.

20974519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 20974519 is about 4579.7946460513. The cubic root of 20974519 is about 275.7807849401.

It can be divided in two parts, 209745 and 19, that added together give a square (209764 = 458²).

The spelling of 20974519 in words is "twenty million, nine hundred seventy-four thousand, five hundred nineteen".