20865973 has 4 divisors (see below), whose sum is σ = 21030400. Its totient is φ = 20701548.

The previous prime is 20865967. The next prime is 20865983. The reversal of 20865973 is 37956802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20865973 - 2⁹ = 20865461 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 (20865983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82023 + ... + 82276.

It is an arithmetic number, because the mean of its divisors is an integer number (5257600).

Almost surely, 2^20865973 is an apocalyptic number.

It is an amenable number.

20865973 is a deficient number, since it is larger than the sum of its proper divisors (164427).

20865973 is a wasteful number, since it uses less digits than its factorization.

20865973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164426.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 20865973 is about 4567.9287428768. The cubic root of 20865973 is about 275.3042275019.

The spelling of 20865973 in words is "twenty million, eight hundred sixty-five thousand, nine hundred seventy-three".