20973445 has 8 divisors (see below), whose sum is σ = 25274880. Its totient is φ = 16707600.

The previous prime is 20973443. The next prime is 20973451. The reversal of 20973445 is 54437902.

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

It is not a de Polignac number, because 20973445 - 2¹ = 20973443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20973445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20973443) 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, 7581 + ... + 9970.

It is an arithmetic number, because the mean of its divisors is an integer number (3159360).

Almost surely, 2^20973445 is an apocalyptic number.

It is an amenable number.

20973445 is a deficient number, since it is larger than the sum of its proper divisors (4301435).

20973445 is a wasteful number, since it uses less digits than its factorization.

20973445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17795.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 20973445 is about 4579.6773903846. The cubic root of 20973445 is about 275.7760777425.

The spelling of 20973445 in words is "twenty million, nine hundred seventy-three thousand, four hundred forty-five".