20366491 has 4 divisors (see below), whose sum is σ = 20376712. Its totient is φ = 20356272.

The previous prime is 20366483. The next prime is 20366501. The reversal of 20366491 is 19466302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20366491 - 2³ = 20366483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20360491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1041 + ... + 6466.

It is an arithmetic number, because the mean of its divisors is an integer number (5094178).

Almost surely, 2^20366491 is an apocalyptic number.

20366491 is a deficient number, since it is larger than the sum of its proper divisors (10221).

20366491 is an equidigital number, since it uses as much as digits as its factorization.

20366491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10220.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 20366491 is about 4512.9248830443. The cubic root of 20366491 is about 273.0897520959.

The spelling of 20366491 in words is "twenty million, three hundred sixty-six thousand, four hundred ninety-one".