20869445 has 8 divisors (see below), whose sum is σ = 25079544. Its totient is φ = 16671424.

The previous prime is 20869423. The next prime is 20869447. The reversal of 20869445 is 54496802.

It can be written as a sum of positive squares in 4 ways, for example, as 5013121 + 15856324 = 2239^2 + 3982^2 .

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 20869445 - 2¹⁴ = 20853061 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20869399 and 20869408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20869447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1367 + ... + 6603.

It is an arithmetic number, because the mean of its divisors is an integer number (3134943).

Almost surely, 2^20869445 is an apocalyptic number.

It is an amenable number.

20869445 is a deficient number, since it is larger than the sum of its proper divisors (4210099).

20869445 is an equidigital number, since it uses as much as digits as its factorization.

20869445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6039.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 20869445 is about 4568.3087680235. The cubic root of 20869445 is about 275.3194964322.

It can be divided in two parts, 20 and 869445, that multiplied together give a square (17388900 = 4170²).

The spelling of 20869445 in words is "twenty million, eight hundred sixty-nine thousand, four hundred forty-five".