20675709 has 8 divisors (see below), whose sum is σ = 30630720. Its totient is φ = 13783788.

The previous prime is 20675701. The next prime is 20675713. The reversal of 20675709 is 90757602.

20675709 is a `hidden beast` number, since 20 + 67 + 570 + 9 = 666.

It is not a de Polignac number, because 20675709 - 2³ = 20675701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20675701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 382857 + ... + 382910.

It is an arithmetic number, because the mean of its divisors is an integer number (3828840).

Almost surely, 2^20675709 is an apocalyptic number.

It is an amenable number.

20675709 is a deficient number, since it is larger than the sum of its proper divisors (9955011).

20675709 is an equidigital number, since it uses as much as digits as its factorization.

20675709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765776 (or 765770 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 20675709 is about 4547.0549809739. The cubic root of 20675709 is about 274.4648944326.

It can be divided in two parts, 2067 and 5709, that added together give a 5-th power (7776 = 6⁵).

The spelling of 20675709 in words is "twenty million, six hundred seventy-five thousand, seven hundred nine".