20496691 has 4 divisors (see below), whose sum is σ = 20695792. Its totient is φ = 20297592.

The previous prime is 20496689. The next prime is 20496701. The reversal of 20496691 is 19669402.

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

It is not a de Polignac number, because 20496691 - 2¹ = 20496689 is a prime.

It is a super-2 number, since 2×20496691² = 840228683898962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20496691.

It is not an unprimeable number, because it can be changed into a prime (20497691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99396 + ... + 99601.

It is an arithmetic number, because the mean of its divisors is an integer number (5173948).

Almost surely, 2^20496691 is an apocalyptic number.

20496691 is a deficient number, since it is larger than the sum of its proper divisors (199101).

20496691 is a wasteful number, since it uses less digits than its factorization.

20496691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199100.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 20496691 is about 4527.3271364018. The cubic root of 20496691 is about 273.6704573496.

The spelling of 20496691 in words is "twenty million, four hundred ninety-six thousand, six hundred ninety-one".