20971701 has 12 divisors (see below), whose sum is σ = 30338412. Its totient is φ = 13959936.

The previous prime is 20971697. The next prime is 20971723. The reversal of 20971701 is 10717902.

It can be written as a sum of positive squares in 2 ways, for example, as 15800625 + 5171076 = 3975^2 + 2274^2 .

It is not a de Polignac number, because 20971701 - 2² = 20971697 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20971751) 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 11 ways as a sum of consecutive naturals, for example, 6565 + ... + 9221.

It is an arithmetic number, because the mean of its divisors is an integer number (2528201).

Almost surely, 2^20971701 is an apocalyptic number.

It is an amenable number.

20971701 is a deficient number, since it is larger than the sum of its proper divisors (9366711).

20971701 is a wasteful number, since it uses less digits than its factorization.

20971701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540 (or 3537 counting only the distinct ones).

The product of its (nonzero) digits is 882, while the sum is 27.

The square root of 20971701 is about 4579.4869800011. The cubic root of 20971701 is about 275.7684336826.

The spelling of 20971701 in words is "twenty million, nine hundred seventy-one thousand, seven hundred one".