20996986 has 16 divisors (see below), whose sum is σ = 33343200. Its totient is φ = 9899568.

The previous prime is 20996977. The next prime is 20997017. The reversal of 20996986 is 68969902.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1716 + ... + 6703.

It is an arithmetic number, because the mean of its divisors is an integer number (2083950).

Almost surely, 2^20996986 is an apocalyptic number.

20996986 is a deficient number, since it is larger than the sum of its proper divisors (12346214).

20996986 is a wasteful number, since it uses less digits than its factorization.

20996986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8493.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 20996986 is about 4582.2468287948. The cubic root of 20996986 is about 275.8792179630.

The spelling of 20996986 in words is "twenty million, nine hundred ninety-six thousand, nine hundred eighty-six".