20683261 has 2 divisors, whose sum is σ = 20683262. Its totient is φ = 20683260.

The previous prime is 20683249. The next prime is 20683277. The reversal of 20683261 is 16238602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 4280761 = 4050^2 + 2069^2 .

It is a cyclic number.

It is not a de Polignac number, because 20683261 - 2⁹ = 20682749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20683211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10341630 + 10341631.

It is an arithmetic number, because the mean of its divisors is an integer number (10341631).

Almost surely, 2^20683261 is an apocalyptic number.

It is an amenable number.

20683261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20683261 is an equidigital number, since it uses as much as digits as its factorization.

20683261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 20683261 is about 4547.8853327673. The cubic root of 20683261 is about 274.4983073387.

It can be divided in two parts, 2068 and 3261, that added together give a square (5329 = 73²).

The spelling of 20683261 in words is "twenty million, six hundred eighty-three thousand, two hundred sixty-one".