20960491 has 4 divisors (see below), whose sum is σ = 20976552. Its totient is φ = 20944432.

The previous prime is 20960453. The next prime is 20960497. The reversal of 20960491 is 19406902.

It is a happy number.

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 20960491 - 2²³ = 12571883 is a prime.

It is a super-2 number, since 2×20960491² = 878684365922162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20960497) 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 in 3 ways as a sum of consecutive naturals, for example, 5881 + ... + 8746.

It is an arithmetic number, because the mean of its divisors is an integer number (5244138).

Almost surely, 2^20960491 is an apocalyptic number.

20960491 is a deficient number, since it is larger than the sum of its proper divisors (16061).

20960491 is a wasteful number, since it uses less digits than its factorization.

20960491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16060.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 20960491 is about 4578.2628801763. The cubic root of 20960491 is about 275.7192894395.

The spelling of 20960491 in words is "twenty million, nine hundred sixty thousand, four hundred ninety-one".