20204761 has 2 divisors, whose sum is σ = 20204762. Its totient is φ = 20204760.

The previous prime is 20204753. The next prime is 20204813. The reversal of 20204761 is 16740202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19749136 + 455625 = 4444^2 + 675^2 .

It is a cyclic number.

It is not a de Polignac number, because 20204761 - 2³ = 20204753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20204731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10102380 + 10102381.

It is an arithmetic number, because the mean of its divisors is an integer number (10102381).

Almost surely, 2^20204761 is an apocalyptic number.

It is an amenable number.

20204761 is a deficient number, since it is larger than the sum of its proper divisors (1).

20204761 is an equidigital number, since it uses as much as digits as its factorization.

20204761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 20204761 is about 4494.9706339419. The cubic root of 20204761 is about 272.3649629733.

Adding to 20204761 its reverse (16740202), we get a palindrome (36944963).

The spelling of 20204761 in words is "twenty million, two hundred four thousand, seven hundred sixty-one".