20072761 has 2 divisors, whose sum is σ = 20072762. Its totient is φ = 20072760.

The previous prime is 20072753. The next prime is 20072771. The reversal of 20072761 is 16727002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 3920400 = 4019^2 + 1980^2 .

It is a cyclic number.

It is not a de Polignac number, because 20072761 - 2³ = 20072753 is a prime.

It is not a weakly prime, because it can be changed into another prime (20072711) 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, 10036380 + 10036381.

It is an arithmetic number, because the mean of its divisors is an integer number (10036381).

Almost surely, 2^20072761 is an apocalyptic number.

It is an amenable number.

20072761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20072761 is an equidigital number, since it uses as much as digits as its factorization.

20072761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 20072761 is about 4480.2634967153. The cubic root of 20072761 is about 271.7705361822.

Adding to 20072761 its reverse (16727002), we get a palindrome (36799763).

The spelling of 20072761 in words is "twenty million, seventy-two thousand, seven hundred sixty-one".