20408369798 has 32 divisors (see below), whose sum is σ = 32684719104. Its totient is φ = 9534837312.

The previous prime is 20408369791. The next prime is 20408369803. The reversal of 20408369798 is 89796380402.

It is a happy number.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20408369791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1173986 + ... + 1191242.

It is an arithmetic number, because the mean of its divisors is an integer number (1021397472).

Almost surely, 2^20408369798 is an apocalyptic number.

20408369798 is a deficient number, since it is larger than the sum of its proper divisors (12276349306).

20408369798 is a wasteful number, since it uses less digits than its factorization.

20408369798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17876.

The product of its (nonzero) digits is 5225472, while the sum is 56.

The spelling of 20408369798 in words is "twenty billion, four hundred eight million, three hundred sixty-nine thousand, seven hundred ninety-eight".