20884999997 has 2 divisors, whose sum is σ = 20884999998. Its totient is φ = 20884999996.

The previous prime is 20884999973. The next prime is 20885000033. The reversal of 20884999997 is 79999948802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18086484196 + 2798515801 = 134486^2 + 52901^2 .

It is a cyclic number.

It is not a de Polignac number, because 20884999997 - 2²⁰ = 20883951421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20884999907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10442499998 + 10442499999.

It is an arithmetic number, because the mean of its divisors is an integer number (10442499999).

Almost surely, 2^20884999997 is an apocalyptic number.

It is an amenable number.

20884999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20884999997 is an equidigital number, since it uses as much as digits as its factorization.

20884999997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211631616, while the sum is 74.

The spelling of 20884999997 in words is "twenty billion, eight hundred eighty-four million, nine hundred ninety-nine thousand, nine hundred ninety-seven".