30020581 has 2 divisors, whose sum is σ = 30020582. Its totient is φ = 30020580.

The previous prime is 30020563. The next prime is 30020591. The reversal of 30020581 is 18502003.

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., 24591681 + 5428900 = 4959^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 30020581 - 2¹⁹ = 29496293 is a prime.

It is a super-2 number, since 2×30020581² = 1802470567155122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30020561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15010290 + 15010291.

It is an arithmetic number, because the mean of its divisors is an integer number (15010291).

Almost surely, 2^30020581 is an apocalyptic number.

It is an amenable number.

30020581 is a deficient number, since it is larger than the sum of its proper divisors (1).

30020581 is an equidigital number, since it uses as much as digits as its factorization.

30020581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 30020581 is about 5479.1040325951. The cubic root of 30020581 is about 310.7942898552.

Adding to 30020581 its reverse (18502003), we get a palindrome (48522584).

The spelling of 30020581 in words is "thirty million, twenty thousand, five hundred eighty-one".