20489741 has 2 divisors, whose sum is σ = 20489742. Its totient is φ = 20489740.

The previous prime is 20489737. The next prime is 20489753. The reversal of 20489741 is 14798402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 687241 = 4450^2 + 829^2 .

It is a cyclic number.

It is not a de Polignac number, because 20489741 - 2² = 20489737 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20489141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10244870 + 10244871.

It is an arithmetic number, because the mean of its divisors is an integer number (10244871).

Almost surely, 2^20489741 is an apocalyptic number.

It is an amenable number.

20489741 is a deficient number, since it is larger than the sum of its proper divisors (1).

20489741 is an equidigital number, since it uses as much as digits as its factorization.

20489741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 20489741 is about 4526.5595102683. The cubic root of 20489741 is about 273.6395218733.

The spelling of 20489741 in words is "twenty million, four hundred eighty-nine thousand, seven hundred forty-one".