20971607 has 8 divisors (see below), whose sum is σ = 21936096. Its totient is φ = 20011552.

The previous prime is 20971583. The next prime is 20971619. The reversal of 20971607 is 70617902.

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

It is a cyclic number.

It is not a de Polignac number, because 20971607 - 2¹⁸ = 20709463 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 (20971627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11993 + ... + 13629.

It is an arithmetic number, because the mean of its divisors is an integer number (2742012).

Almost surely, 2^20971607 is an apocalyptic number.

20971607 is a deficient number, since it is larger than the sum of its proper divisors (964489).

20971607 is a wasteful number, since it uses less digits than its factorization.

20971607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 20971607 is about 4579.4767168313. The cubic root of 20971607 is about 275.7680216627.

The spelling of 20971607 in words is "twenty million, nine hundred seventy-one thousand, six hundred seven".