20408813533 has 2 divisors, whose sum is σ = 20408813534. Its totient is φ = 20408813532.

The previous prime is 20408813527. The next prime is 20408813603. The reversal of 20408813533 is 33531880402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19990283769 + 418529764 = 141387^2 + 20458^2 .

It is a cyclic number.

It is not a de Polignac number, because 20408813533 - 2¹³ = 20408805341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20408813492 and 20408813501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20400813533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10204406766 + 10204406767.

It is an arithmetic number, because the mean of its divisors is an integer number (10204406767).

Almost surely, 2^20408813533 is an apocalyptic number.

It is an amenable number.

20408813533 is a deficient number, since it is larger than the sum of its proper divisors (1).

20408813533 is an equidigital number, since it uses as much as digits as its factorization.

20408813533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 20408813533 in words is "twenty billion, four hundred eight million, eight hundred thirteen thousand, five hundred thirty-three".