20772745 has 8 divisors (see below), whose sum is σ = 28488384. Its totient is φ = 14244144.

The previous prime is 20772709. The next prime is 20772751. The reversal of 20772745 is 54727702.

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 20772745 - 2⁹ = 20772233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20772745.

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, 296719 + ... + 296788.

It is an arithmetic number, because the mean of its divisors is an integer number (3561048).

Almost surely, 2^20772745 is an apocalyptic number.

It is an amenable number.

20772745 is a deficient number, since it is larger than the sum of its proper divisors (7715639).

20772745 is an equidigital number, since it uses as much as digits as its factorization.

20772745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593519.

The product of its (nonzero) digits is 27440, while the sum is 34.

The square root of 20772745 is about 4557.7126938849. The cubic root of 20772745 is about 274.8936007120.

The spelling of 20772745 in words is "twenty million, seven hundred seventy-two thousand, seven hundred forty-five".