20382709 has 4 divisors (see below), whose sum is σ = 20584620. Its totient is φ = 20180800.

The previous prime is 20382701. The next prime is 20382721. The reversal of 20382709 is 90728302.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15824484 + 4558225 = 3978^2 + 2135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20382709 - 2³ = 20382701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20382701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100804 + ... + 101005.

It is an arithmetic number, because the mean of its divisors is an integer number (5146155).

Almost surely, 2^20382709 is an apocalyptic number.

It is an amenable number.

20382709 is a deficient number, since it is larger than the sum of its proper divisors (201911).

20382709 is a wasteful number, since it uses less digits than its factorization.

20382709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201910.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 20382709 is about 4514.7213646027. The cubic root of 20382709 is about 273.1622207163.

The spelling of 20382709 in words is "twenty million, three hundred eighty-two thousand, seven hundred nine".