20012761 has 2 divisors, whose sum is σ = 20012762. Its totient is φ = 20012760.

The previous prime is 20012743. The next prime is 20012767. The reversal of 20012761 is 16721002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13278736 + 6734025 = 3644^2 + 2595^2 .

It is a cyclic number.

It is not a de Polignac number, because 20012761 - 2¹⁹ = 19488473 is a prime.

It is not a weakly prime, because it can be changed into another prime (20012767) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006380 + 10006381.

It is an arithmetic number, because the mean of its divisors is an integer number (10006381).

Almost surely, 2^20012761 is an apocalyptic number.

It is an amenable number.

20012761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012761 is an equidigital number, since it uses as much as digits as its factorization.

20012761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 20012761 is about 4473.5624506650. The cubic root of 20012761 is about 271.4994805241.

Adding to 20012761 its reverse (16721002), we get a palindrome (36733763).

The spelling of 20012761 in words is "twenty million, twelve thousand, seven hundred sixty-one".