20467561 has 2 divisors, whose sum is σ = 20467562. Its totient is φ = 20467560.

The previous prime is 20467553. The next prime is 20467583. The reversal of 20467561 is 16576402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16974400 + 3493161 = 4120^2 + 1869^2 .

It is a cyclic number.

It is not a de Polignac number, because 20467561 - 2³ = 20467553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20467501) 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, 10233780 + 10233781.

It is an arithmetic number, because the mean of its divisors is an integer number (10233781).

Almost surely, 2^20467561 is an apocalyptic number.

It is an amenable number.

20467561 is a deficient number, since it is larger than the sum of its proper divisors (1).

20467561 is an equidigital number, since it uses as much as digits as its factorization.

20467561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 20467561 is about 4524.1088625275. The cubic root of 20467561 is about 273.5407486073.

The spelling of 20467561 in words is "twenty million, four hundred sixty-seven thousand, five hundred sixty-one".