20653489 has 2 divisors, whose sum is σ = 20653490. Its totient is φ = 20653488.

The previous prime is 20653469. The next prime is 20653499. The reversal of 20653489 is 98435602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18147600 + 2505889 = 4260^2 + 1583^2 .

It is a cyclic number.

It is not a de Polignac number, because 20653489 - 2¹¹ = 20651441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20653439) 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, 10326744 + 10326745.

It is an arithmetic number, because the mean of its divisors is an integer number (10326745).

Almost surely, 2^20653489 is an apocalyptic number.

It is an amenable number.

20653489 is a deficient number, since it is larger than the sum of its proper divisors (1).

20653489 is an equidigital number, since it uses as much as digits as its factorization.

20653489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 20653489 is about 4544.6109844518. The cubic root of 20653489 is about 274.3665375320.

The spelling of 20653489 in words is "twenty million, six hundred fifty-three thousand, four hundred eighty-nine".