20681701 has 2 divisors, whose sum is σ = 20681702. Its totient is φ = 20681700.

The previous prime is 20681663. The next prime is 20681711. The reversal of 20681701 is 10718602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 160801 = 4530^2 + 401^2 .

It is a cyclic number.

It is not a de Polignac number, because 20681701 - 2¹¹ = 20679653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20681711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10340850 + 10340851.

It is an arithmetic number, because the mean of its divisors is an integer number (10340851).

Almost surely, 2^20681701 is an apocalyptic number.

It is an amenable number.

20681701 is a deficient number, since it is larger than the sum of its proper divisors (1).

20681701 is an equidigital number, since it uses as much as digits as its factorization.

20681701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 20681701 is about 4547.7138212513. The cubic root of 20681701 is about 274.4914059749.

The spelling of 20681701 in words is "twenty million, six hundred eighty-one thousand, seven hundred one".