20689444863 has 24 divisors (see below), whose sum is σ = 31712653440. Its totient is φ = 12969646800.

The previous prime is 20689444861. The next prime is 20689444903. The reversal of 20689444863 is 36844498602.

It is not a de Polignac number, because 20689444863 - 2¹ = 20689444861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20689444861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 834813 + ... + 859238.

It is an arithmetic number, because the mean of its divisors is an integer number (1321360560).

Almost surely, 2^20689444863 is an apocalyptic number.

20689444863 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

20689444863 is a deficient number, since it is larger than the sum of its proper divisors (11023208577).

20689444863 is a wasteful number, since it uses less digits than its factorization.

20689444863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694139 (or 1694136 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 54.

The spelling of 20689444863 in words is "twenty billion, six hundred eighty-nine million, four hundred forty-four thousand, eight hundred sixty-three".