20486491 has 4 divisors (see below), whose sum is σ = 21377232. Its totient is φ = 19595752.

The previous prime is 20486489. The next prime is 20486507. The reversal of 20486491 is 19468402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20486491 - 2¹ = 20486489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20486891) 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, 445336 + ... + 445381.

It is an arithmetic number, because the mean of its divisors is an integer number (5344308).

Almost surely, 2^20486491 is an apocalyptic number.

20486491 is a deficient number, since it is larger than the sum of its proper divisors (890741).

20486491 is an equidigital number, since it uses as much as digits as its factorization.

20486491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890740.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 20486491 is about 4526.2005037338. The cubic root of 20486491 is about 273.6250532429.

The spelling of 20486491 in words is "twenty million, four hundred eighty-six thousand, four hundred ninety-one".