20745061 has 2 divisors, whose sum is σ = 20745062. Its totient is φ = 20745060.

The previous prime is 20745059. The next prime is 20745073. The reversal of 20745061 is 16054702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16769025 + 3976036 = 4095^2 + 1994^2 .

It is a cyclic number.

It is not a de Polignac number, because 20745061 - 2¹ = 20745059 is a prime.

Together with 20745059, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20745031) 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, 10372530 + 10372531.

It is an arithmetic number, because the mean of its divisors is an integer number (10372531).

Almost surely, 2^20745061 is an apocalyptic number.

It is an amenable number.

20745061 is a deficient number, since it is larger than the sum of its proper divisors (1).

20745061 is an equidigital number, since it uses as much as digits as its factorization.

20745061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 20745061 is about 4554.6746316285. The cubic root of 20745061 is about 274.7714288044.

Adding to 20745061 its reverse (16054702), we get a palindrome (36799763).

The spelling of 20745061 in words is "twenty million, seven hundred forty-five thousand, sixty-one".