20840073 has 8 divisors (see below), whose sum is σ = 27861600. Its totient is φ = 13855968.

The previous prime is 20840063. The next prime is 20840087. The reversal of 20840073 is 37004802.

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

It is not a de Polignac number, because 20840073 - 2⁵ = 20840041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20840033) 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, 8028 + ... + 10301.

It is an arithmetic number, because the mean of its divisors is an integer number (3482700).

Almost surely, 2^20840073 is an apocalyptic number.

It is an amenable number.

20840073 is a deficient number, since it is larger than the sum of its proper divisors (7021527).

20840073 is a wasteful number, since it uses less digits than its factorization.

20840073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18711.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 20840073 is about 4565.0928796685. The cubic root of 20840073 is about 275.1902727275.

Adding to 20840073 its reverse (37004802), we get a palindrome (57844875).

The spelling of 20840073 in words is "twenty million, eight hundred forty thousand, seventy-three".