20870445 has 8 divisors (see below), whose sum is σ = 33392736. Its totient is φ = 11130896.

The previous prime is 20870429. The next prime is 20870449. The reversal of 20870445 is 54407802.

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 20870445 - 2⁴ = 20870429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870449) 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, 695667 + ... + 695696.

It is an arithmetic number, because the mean of its divisors is an integer number (4174092).

Almost surely, 2^20870445 is an apocalyptic number.

It is an amenable number.

20870445 is a deficient number, since it is larger than the sum of its proper divisors (12522291).

20870445 is a wasteful number, since it uses less digits than its factorization.

20870445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391371.

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 20870445 is about 4568.4182164071. The cubic root of 20870445 is about 275.3238938515.

The spelling of 20870445 in words is "twenty million, eight hundred seventy thousand, four hundred forty-five".