20331061 has 2 divisors, whose sum is σ = 20331062. Its totient is φ = 20331060.

The previous prime is 20331053. The next prime is 20331079. The reversal of 20331061 is 16013302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17690436 + 2640625 = 4206^2 + 1625^2 .

It is a cyclic number.

It is not a de Polignac number, because 20331061 - 2³ = 20331053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331161) 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, 10165530 + 10165531.

It is an arithmetic number, because the mean of its divisors is an integer number (10165531).

Almost surely, 2^20331061 is an apocalyptic number.

It is an amenable number.

20331061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331061 is an equidigital number, since it uses as much as digits as its factorization.

20331061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 20331061 is about 4508.9977822128. The cubic root of 20331061 is about 272.9313025139.

Adding to 20331061 its reverse (16013302), we get a palindrome (36344363).

The spelling of 20331061 in words is "twenty million, three hundred thirty-one thousand, sixty-one".