13020491808 has 144 divisors (see below), whose sum is σ = 38511607680. Its totient is φ = 4169138688.

The previous prime is 13020491747. The next prime is 13020491819. The reversal of 13020491808 is 80819402031.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 834091 + ... + 849557.

It is an arithmetic number, because the mean of its divisors is an integer number (267441720).

Almost surely, 2^13020491808 is an apocalyptic number.

13020491808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13020491808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19255803840).

13020491808 is an abundant number, since it is smaller than the sum of its proper divisors (25491115872).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13020491808 is a wasteful number, since it uses less digits than its factorization.

13020491808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15599 (or 15588 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

Adding to 13020491808 its reverse (80819402031), we get a palindrome (93839893839).

The spelling of 13020491808 in words is "thirteen billion, twenty million, four hundred ninety-one thousand, eight hundred eight".