20717996 has 12 divisors (see below), whose sum is σ = 39045552. Its totient is φ = 9562128.

The previous prime is 20717993. The next prime is 20718011. The reversal of 20717996 is 69971702.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20717993) 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, 199160 + ... + 199263.

It is an arithmetic number, because the mean of its divisors is an integer number (3253796).

Almost surely, 2^20717996 is an apocalyptic number.

20717996 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20717996 is a deficient number, since it is larger than the sum of its proper divisors (18327556).

20717996 is a wasteful number, since it uses less digits than its factorization.

20717996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398440 (or 398438 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 20717996 is about 4551.7025386112. The cubic root of 20717996 is about 274.6518834798.

The spelling of 20717996 in words is "twenty million, seven hundred seventeen thousand, nine hundred ninety-six".