20786906 has 16 divisors (see below), whose sum is σ = 36004416. Its totient is φ = 8816256.

The previous prime is 20786879. The next prime is 20786921. The reversal of 20786906 is 60968702.

It is a super-2 number, since 2×20786906² = 864190922105672, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20786906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6296 + ... + 9011.

It is an arithmetic number, because the mean of its divisors is an integer number (2250276).

Almost surely, 2^20786906 is an apocalyptic number.

20786906 is a deficient number, since it is larger than the sum of its proper divisors (15217510).

20786906 is a wasteful number, since it uses less digits than its factorization.

20786906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15413.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 20786906 is about 4559.2659496897. The cubic root of 20786906 is about 274.9560524813.

The spelling of 20786906 in words is "twenty million, seven hundred eighty-six thousand, nine hundred six".