20868445 has 8 divisors (see below), whose sum is σ = 26968536. Its totient is φ = 15410496.

The previous prime is 20868443. The next prime is 20868451. The reversal of 20868445 is 54486802.

It can be written as a sum of positive squares in 4 ways, for example, as 320356 + 20548089 = 566^2 + 4533^2 .

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 20868445 - 2¹ = 20868443 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 (20868443) 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, 160462 + ... + 160591.

It is an arithmetic number, because the mean of its divisors is an integer number (3371067).

Almost surely, 2^20868445 is an apocalyptic number.

It is an amenable number.

20868445 is a deficient number, since it is larger than the sum of its proper divisors (6100091).

20868445 is a wasteful number, since it uses less digits than its factorization.

20868445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321071.

The product of its (nonzero) digits is 61440, while the sum is 37.

The square root of 20868445 is about 4568.1993170176. The cubic root of 20868445 is about 275.3150988725.

The spelling of 20868445 in words is "twenty million, eight hundred sixty-eight thousand, four hundred forty-five".