20635673 has 2 divisors, whose sum is σ = 20635674. Its totient is φ = 20635672.

The previous prime is 20635649. The next prime is 20635687. The reversal of 20635673 is 37653602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20313049 + 322624 = 4507^2 + 568^2 .

It is a cyclic number.

It is not a de Polignac number, because 20635673 - 2¹² = 20631577 is a prime.

It is not a weakly prime, because it can be changed into another prime (20635633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10317836 + 10317837.

It is an arithmetic number, because the mean of its divisors is an integer number (10317837).

Almost surely, 2^20635673 is an apocalyptic number.

It is an amenable number.

20635673 is a deficient number, since it is larger than the sum of its proper divisors (1).

20635673 is an equidigital number, since it uses as much as digits as its factorization.

20635673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 20635673 is about 4542.6504377951. The cubic root of 20635673 is about 274.2876239817.

The spelling of 20635673 in words is "twenty million, six hundred thirty-five thousand, six hundred seventy-three".