20923986 has 8 divisors (see below), whose sum is σ = 41847984. Its totient is φ = 6974660.

The previous prime is 20923979. The next prime is 20923999. The reversal of 20923986 is 68932902.

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

20923986 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1743660 + ... + 1743671.

It is an arithmetic number, because the mean of its divisors is an integer number (5230998).

Almost surely, 2^20923986 is an apocalyptic number.

20923986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20923986 is a wasteful number, since it uses less digits than its factorization.

20923986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3487336.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 20923986 is about 4574.2743686841. The cubic root of 20923986 is about 275.5591312718.

The spelling of 20923986 in words is "twenty million, nine hundred twenty-three thousand, nine hundred eighty-six".