20708973 has 8 divisors (see below), whose sum is σ = 30680000. Its totient is φ = 13805964.

The previous prime is 20708971. The next prime is 20709041. The reversal of 20708973 is 37980702.

It is not a de Polignac number, because 20708973 - 2¹ = 20708971 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20708971) 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, 383473 + ... + 383526.

It is an arithmetic number, because the mean of its divisors is an integer number (3835000).

Almost surely, 2^20708973 is an apocalyptic number.

It is an amenable number.

20708973 is a deficient number, since it is larger than the sum of its proper divisors (9971027).

20708973 is an equidigital number, since it uses as much as digits as its factorization.

20708973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767008 (or 767002 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 20708973 is about 4550.7112630884. The cubic root of 20708973 is about 274.6120060097.

The spelling of 20708973 in words is "twenty million, seven hundred eight thousand, nine hundred seventy-three".