20486591 has 4 divisors (see below), whose sum is σ = 20499432. Its totient is φ = 20473752.

The previous prime is 20486573. The next prime is 20486611. The reversal of 20486591 is 19568402.

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 20486591 - 2⁶ = 20486527 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20486551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3620 + ... + 7353.

It is an arithmetic number, because the mean of its divisors is an integer number (5124858).

Almost surely, 2^20486591 is an apocalyptic number.

20486591 is a deficient number, since it is larger than the sum of its proper divisors (12841).

20486591 is a wasteful number, since it uses less digits than its factorization.

20486591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12840.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 20486591 is about 4526.2115505133. The cubic root of 20486591 is about 273.6254984543.

The spelling of 20486591 in words is "twenty million, four hundred eighty-six thousand, five hundred ninety-one".