20974686 has 8 divisors (see below), whose sum is σ = 41949384. Its totient is φ = 6991560.

The previous prime is 20974663. The next prime is 20974687. The reversal of 20974686 is 68647902.

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

20974686 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20974687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1747885 + ... + 1747896.

It is an arithmetic number, because the mean of its divisors is an integer number (5243673).

Almost surely, 2^20974686 is an apocalyptic number.

20974686 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.

20974686 is a wasteful number, since it uses less digits than its factorization.

20974686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3495786.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 20974686 is about 4579.8128782735. The cubic root of 20974686 is about 275.7815168642.

The spelling of 20974686 in words is "twenty million, nine hundred seventy-four thousand, six hundred eighty-six".