20491113 has 8 divisors (see below), whose sum is σ = 27784800. Its totient is φ = 13429088.

The previous prime is 20491111. The next prime is 20491127. The reversal of 20491113 is 31119402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20491113 - 2¹ = 20491111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20491113.

It is not an unprimeable number, because it can be changed into a prime (20491111) 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 7 ways as a sum of consecutive naturals, for example, 57708 + ... + 58061.

It is an arithmetic number, because the mean of its divisors is an integer number (3473100).

Almost surely, 2^20491113 is an apocalyptic number.

It is an amenable number.

20491113 is a deficient number, since it is larger than the sum of its proper divisors (7293687).

20491113 is a wasteful number, since it uses less digits than its factorization.

20491113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115831.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 20491113 is about 4526.7110577107. The cubic root of 20491113 is about 273.6456294020.

The spelling of 20491113 in words is "twenty million, four hundred ninety-one thousand, one hundred thirteen".