18820771 has 2 divisors, whose sum is σ = 18820772. Its totient is φ = 18820770.

The previous prime is 18820729. The next prime is 18820793. The reversal of 18820771 is 17702881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18820771 - 2⁹ = 18820259 is a prime.

It is not a weakly prime, because it can be changed into another prime (18823771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9410385 + 9410386.

It is an arithmetic number, because the mean of its divisors is an integer number (9410386).

Almost surely, 2^18820771 is an apocalyptic number.

18820771 is a deficient number, since it is larger than the sum of its proper divisors (1).

18820771 is an equidigital number, since it uses as much as digits as its factorization.

18820771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 34.

The square root of 18820771 is about 4338.2912534776. The cubic root of 18820771 is about 265.9984689078.

It can be divided in two parts, 18820 and 771, that added together give a palindrome (19591).

The spelling of 18820771 in words is "eighteen million, eight hundred twenty thousand, seven hundred seventy-one".