20884518829 has 2 divisors, whose sum is σ = 20884518830. Its totient is φ = 20884518828.

The previous prime is 20884518727. The next prime is 20884518839. The reversal of 20884518829 is 92881548802.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20744640900 + 139877929 = 144030^2 + 11827^2 .

It is a cyclic number.

It is not a de Polignac number, because 20884518829 - 2¹³ = 20884510637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20884518829.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20884518839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10442259414 + 10442259415.

It is an arithmetic number, because the mean of its divisors is an integer number (10442259415).

Almost surely, 2^20884518829 is an apocalyptic number.

It is an amenable number.

20884518829 is a deficient number, since it is larger than the sum of its proper divisors (1).

20884518829 is an equidigital number, since it uses as much as digits as its factorization.

20884518829 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2949120, while the sum is 55.

The spelling of 20884518829 in words is "twenty billion, eight hundred eighty-four million, five hundred eighteen thousand, eight hundred twenty-nine".