20830549 has 2 divisors, whose sum is σ = 20830550. Its totient is φ = 20830548.

The previous prime is 20830547. The next prime is 20830573. The reversal of 20830549 is 94503802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19580625 + 1249924 = 4425^2 + 1118^2 .

It is a cyclic number.

It is not a de Polignac number, because 20830549 - 2¹ = 20830547 is a prime.

Together with 20830547, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 20830549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20830547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415274 + 10415275.

It is an arithmetic number, because the mean of its divisors is an integer number (10415275).

Almost surely, 2^20830549 is an apocalyptic number.

It is an amenable number.

20830549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20830549 is an equidigital number, since it uses as much as digits as its factorization.

20830549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 20830549 is about 4564.0496272499. The cubic root of 20830549 is about 275.1483453069.

The spelling of 20830549 in words is "twenty million, eight hundred thirty thousand, five hundred forty-nine".