20609766 has 24 divisors (see below), whose sum is σ = 44746104. Its totient is φ = 6855840.

The previous prime is 20609753. The next prime is 20609773. The reversal of 20609766 is 66790602.

It is a self number, because there is not a number n which added to its sum of digits gives 20609766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11610 + ... + 13266.

It is an arithmetic number, because the mean of its divisors is an integer number (1864421).

Almost surely, 2^20609766 is an apocalyptic number.

20609766 is an abundant number, since it is smaller than the sum of its proper divisors (24136338).

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

20609766 is a wasteful number, since it uses less digits than its factorization.

20609766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356 (or 2353 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 20609766 is about 4539.7980131279. The cubic root of 20609766 is about 274.1727913603.

The spelling of 20609766 in words is "twenty million, six hundred nine thousand, seven hundred sixty-six".