20705653 has 2 divisors, whose sum is σ = 20705654. Its totient is φ = 20705652.

The previous prime is 20705651. The next prime is 20705683. The reversal of 20705653 is 35650702.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11985444 + 8720209 = 3462^2 + 2953^2 .

It is a cyclic number.

It is not a de Polignac number, because 20705653 - 2¹ = 20705651 is a prime.

Together with 20705651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20705651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10352826 + 10352827.

It is an arithmetic number, because the mean of its divisors is an integer number (10352827).

Almost surely, 2^20705653 is an apocalyptic number.

It is an amenable number.

20705653 is a deficient number, since it is larger than the sum of its proper divisors (1).

20705653 is an equidigital number, since it uses as much as digits as its factorization.

20705653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 20705653 is about 4550.3464703251. The cubic root of 20705653 is about 274.5973302363.

The spelling of 20705653 in words is "twenty million, seven hundred five thousand, six hundred fifty-three".