20870973 has 16 divisors (see below), whose sum is σ = 30997440. Its totient is φ = 13879152.

The previous prime is 20870939. The next prime is 20871001. The reversal of 20870973 is 37907802.

It is not a de Polignac number, because 20870973 - 2⁶ = 20870909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20870573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14515 + ... + 15887.

It is an arithmetic number, because the mean of its divisors is an integer number (1937340).

Almost surely, 2^20870973 is an apocalyptic number.

It is an amenable number.

20870973 is a deficient number, since it is larger than the sum of its proper divisors (10126467).

20870973 is a wasteful number, since it uses less digits than its factorization.

20870973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1945 (or 1939 counting only the distinct ones).

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

The square root of 20870973 is about 4568.4760040959. The cubic root of 20870973 is about 275.3262156322.

The spelling of 20870973 in words is "twenty million, eight hundred seventy thousand, nine hundred seventy-three".