20973653 has 2 divisors, whose sum is σ = 20973654. Its totient is φ = 20973652.

The previous prime is 20973643. The next prime is 20973679. The reversal of 20973653 is 35637902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15697444 + 5276209 = 3962^2 + 2297^2 .

It is a cyclic number.

It is not a de Polignac number, because 20973653 - 2¹⁶ = 20908117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20973643) 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 as a sum of consecutive naturals, namely, 10486826 + 10486827.

It is an arithmetic number, because the mean of its divisors is an integer number (10486827).

Almost surely, 2^20973653 is an apocalyptic number.

It is an amenable number.

20973653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20973653 is an equidigital number, since it uses as much as digits as its factorization.

20973653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34020, while the sum is 35.

The square root of 20973653 is about 4579.7000993515. The cubic root of 20973653 is about 275.7769893911.

The spelling of 20973653 in words is "twenty million, nine hundred seventy-three thousand, six hundred fifty-three".