20691946 has 8 divisors (see below), whose sum is σ = 33859584. Its totient is φ = 9405420.

The previous prime is 20691929. The next prime is 20691959. The reversal of 20691946 is 64919602.

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

It is an unprimeable number.

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, 470250 + ... + 470293.

It is an arithmetic number, because the mean of its divisors is an integer number (4232448).

Almost surely, 2^20691946 is an apocalyptic number.

20691946 is a deficient number, since it is larger than the sum of its proper divisors (13167638).

20691946 is a wasteful number, since it uses less digits than its factorization.

20691946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940556.

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

The square root of 20691946 is about 4548.8400719304. The cubic root of 20691946 is about 274.5367230120.

The spelling of 20691946 in words is "twenty million, six hundred ninety-one thousand, nine hundred forty-six".