20855439533 has 2 divisors, whose sum is σ = 20855439534. Its totient is φ = 20855439532.

The previous prime is 20855439439. The next prime is 20855439587. The reversal of 20855439533 is 33593455802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16109194084 + 4746245449 = 126922^2 + 68893^2 .

It is a cyclic number.

It is not a de Polignac number, because 20855439533 - 2²⁰ = 20854390957 is a prime.

It is a super-2 number, since 2×20855439533² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20855436533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10427719766 + 10427719767.

It is an arithmetic number, because the mean of its divisors is an integer number (10427719767).

Almost surely, 2^20855439533 is an apocalyptic number.

It is an amenable number.

20855439533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20855439533 is an equidigital number, since it uses as much as digits as its factorization.

20855439533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 20855439533 in words is "twenty billion, eight hundred fifty-five million, four hundred thirty-nine thousand, five hundred thirty-three".