20186461 has 2 divisors, whose sum is σ = 20186462. Its totient is φ = 20186460.

The previous prime is 20186447. The next prime is 20186501. The reversal of 20186461 is 16468102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18576100 + 1610361 = 4310^2 + 1269^2 .

It is a cyclic number.

It is not a de Polignac number, because 20186461 - 2¹⁹ = 19662173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20186161) 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, 10093230 + 10093231.

It is an arithmetic number, because the mean of its divisors is an integer number (10093231).

Almost surely, 2^20186461 is an apocalyptic number.

It is an amenable number.

20186461 is a deficient number, since it is larger than the sum of its proper divisors (1).

20186461 is an equidigital number, since it uses as much as digits as its factorization.

20186461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 20186461 is about 4492.9345644022. The cubic root of 20186461 is about 272.2827086904.

The spelling of 20186461 in words is "twenty million, one hundred eighty-six thousand, four hundred sixty-one".