18520829 has 2 divisors, whose sum is σ = 18520830. Its totient is φ = 18520828.

The previous prime is 18520793. The next prime is 18520841. The reversal of 18520829 is 92802581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18062500 + 458329 = 4250^2 + 677^2 .

It is a cyclic number.

It is not a de Polignac number, because 18520829 - 2²⁴ = 1743613 is a prime.

It is a super-2 number, since 2×18520829² = 686042213694482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18520729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9260414 + 9260415.

It is an arithmetic number, because the mean of its divisors is an integer number (9260415).

Almost surely, 2^18520829 is an apocalyptic number.

It is an amenable number.

18520829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18520829 is an equidigital number, since it uses as much as digits as its factorization.

18520829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 18520829 is about 4303.5832744354. The cubic root of 18520829 is about 264.5778445193.

The spelling of 18520829 in words is "eighteen million, five hundred twenty thousand, eight hundred twenty-nine".