20658481 has 2 divisors, whose sum is σ = 20658482. Its totient is φ = 20658480.

The previous prime is 20658467. The next prime is 20658503. The reversal of 20658481 is 18485602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 2030625 = 4316^2 + 1425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20658481 is a prime.

It is a super-2 number, since 2×20658481² = 853545674454722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20658581) 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, 10329240 + 10329241.

It is an arithmetic number, because the mean of its divisors is an integer number (10329241).

Almost surely, 2^20658481 is an apocalyptic number.

It is an amenable number.

20658481 is a deficient number, since it is larger than the sum of its proper divisors (1).

20658481 is an equidigital number, since it uses as much as digits as its factorization.

20658481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 20658481 is about 4545.1601731952. The cubic root of 20658481 is about 274.3886407776.

The spelling of 20658481 in words is "twenty million, six hundred fifty-eight thousand, four hundred eighty-one".