20909996 has 12 divisors (see below), whose sum is σ = 37773120. Its totient is φ = 10117680.

The previous prime is 20909989. The next prime is 20910011. The reversal of 20909996 is 69990902.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84191 + ... + 84438.

It is an arithmetic number, because the mean of its divisors is an integer number (3147760).

Almost surely, 2^20909996 is an apocalyptic number.

It is an amenable number.

20909996 is a deficient number, since it is larger than the sum of its proper divisors (16863124).

20909996 is a wasteful number, since it uses less digits than its factorization.

20909996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168664 (or 168662 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 20909996 is about 4572.7449086954. The cubic root of 20909996 is about 275.4977036555.

The spelling of 20909996 in words is "twenty million, nine hundred nine thousand, nine hundred ninety-six".