20702065 has 8 divisors (see below), whose sum is σ = 25311528. Its totient is φ = 16248960.

The previous prime is 20702063. The next prime is 20702069. The reversal of 20702065 is 56020702.

It can be written as a sum of positive squares in 4 ways, for example, as 4129024 + 16573041 = 2032^2 + 4071^2 .

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

It is not a de Polignac number, because 20702065 - 2¹ = 20702063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20702063) 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, 38796 + ... + 39325.

It is an arithmetic number, because the mean of its divisors is an integer number (3163941).

Almost surely, 2^20702065 is an apocalyptic number.

It is an amenable number.

20702065 is a deficient number, since it is larger than the sum of its proper divisors (4609463).

20702065 is an equidigital number, since it uses as much as digits as its factorization.

20702065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78179.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 20702065 is about 4549.9521975511. The cubic root of 20702065 is about 274.5814680281.

Adding to 20702065 its reverse (56020702), we get a palindrome (76722767).

The spelling of 20702065 in words is "twenty million, seven hundred two thousand, sixty-five".