20874493 has 2 divisors, whose sum is σ = 20874494. Its totient is φ = 20874492.

The previous prime is 20874473. The next prime is 20874509. The reversal of 20874493 is 39447802.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 2913849 = 4238^2 + 1707^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20874493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20874463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10437246 + 10437247.

It is an arithmetic number, because the mean of its divisors is an integer number (10437247).

Almost surely, 2^20874493 is an apocalyptic number.

It is an amenable number.

20874493 is a deficient number, since it is larger than the sum of its proper divisors (1).

20874493 is an equidigital number, since it uses as much as digits as its factorization.

20874493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 20874493 is about 4568.8612366759. The cubic root of 20874493 is about 275.3416931697.

The spelling of 20874493 in words is "twenty million, eight hundred seventy-four thousand, four hundred ninety-three".