20906065853 has 2 divisors, whose sum is σ = 20906065854. Its totient is φ = 20906065852.

The previous prime is 20906065847. The next prime is 20906065909. The reversal of 20906065853 is 35856060902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13934149849 + 6971916004 = 118043^2 + 83498^2 .

It is a cyclic number.

It is not a de Polignac number, because 20906065853 - 2⁴ = 20906065837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20906068853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10453032926 + 10453032927.

It is an arithmetic number, because the mean of its divisors is an integer number (10453032927).

Almost surely, 2^20906065853 is an apocalyptic number.

It is an amenable number.

20906065853 is a deficient number, since it is larger than the sum of its proper divisors (1).

20906065853 is an equidigital number, since it uses as much as digits as its factorization.

20906065853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 20906065853 in words is "twenty billion, nine hundred six million, sixty-five thousand, eight hundred fifty-three".