20772705 has 8 divisors (see below), whose sum is σ = 33236352. Its totient is φ = 11078768.

The previous prime is 20772667. The next prime is 20772707. The reversal of 20772705 is 50727702.

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

It is a cyclic number.

It is not a de Polignac number, because 20772705 - 2⁶ = 20772641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20772707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 692409 + ... + 692438.

It is an arithmetic number, because the mean of its divisors is an integer number (4154544).

Almost surely, 2^20772705 is an apocalyptic number.

It is an amenable number.

20772705 is a deficient number, since it is larger than the sum of its proper divisors (12463647).

20772705 is a wasteful number, since it uses less digits than its factorization.

20772705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384855.

The product of its (nonzero) digits is 6860, while the sum is 30.

The square root of 20772705 is about 4557.7083057168. The cubic root of 20772705 is about 274.8934242668.

The spelling of 20772705 in words is "twenty million, seven hundred seventy-two thousand, seven hundred five".