20970937 has 4 divisors (see below), whose sum is σ = 22584100. Its totient is φ = 19357776.

The previous prime is 20970931. The next prime is 20970947. The reversal of 20970937 is 73907902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1354896 + 19616041 = 1164^2 + 4429^2 .

It is a cyclic number.

It is not a de Polignac number, because 20970937 - 2¹¹ = 20968889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20970896 and 20970905.

It is not an unprimeable number, because it can be changed into a prime (20970931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806562 + ... + 806587.

It is an arithmetic number, because the mean of its divisors is an integer number (5646025).

Almost surely, 2^20970937 is an apocalyptic number.

It is an amenable number.

20970937 is a deficient number, since it is larger than the sum of its proper divisors (1613163).

20970937 is a wasteful number, since it uses less digits than its factorization.

20970937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1613162.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 20970937 is about 4579.4035637843. The cubic root of 20970937 is about 275.7650848898.

The spelling of 20970937 in words is "twenty million, nine hundred seventy thousand, nine hundred thirty-seven".