20766121 has 2 divisors, whose sum is σ = 20766122. Its totient is φ = 20766120.

The previous prime is 20766113. The next prime is 20766127. The reversal of 20766121 is 12166702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16810000 + 3956121 = 4100^2 + 1989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20766121 - 2³ = 20766113 is a prime.

It is not a weakly prime, because it can be changed into another prime (20766127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10383060 + 10383061.

It is an arithmetic number, because the mean of its divisors is an integer number (10383061).

Almost surely, 2^20766121 is an apocalyptic number.

It is an amenable number.

20766121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20766121 is an equidigital number, since it uses as much as digits as its factorization.

20766121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 20766121 is about 4556.9859556509. The cubic root of 20766121 is about 274.8643783055.

The spelling of 20766121 in words is "twenty million, seven hundred sixty-six thousand, one hundred twenty-one".