20043551808 has 336 divisors, whose sum is σ = 67220689536. Its totient is φ = 5592268800.

The previous prime is 20043551791. The next prime is 20043551809. The reversal of 20043551808 is 80815534002.

It is a happy number.

20043551808 is a `hidden beast` number, since 20 + 0 + 4 + 3 + 551 + 80 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

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

It is not an unprimeable number, because it can be changed into a prime (20043551809) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33799960 + ... + 33800552.

It is an arithmetic number, because the mean of its divisors is an integer number (200061576).

Almost surely, 2^20043551808 is an apocalyptic number.

20043551808 is a gapful number since it is divisible by the number (28) 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 20043551808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33610344768).

20043551808 is an abundant number, since it is smaller than the sum of its proper divisors (47177137728).

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

20043551808 is a wasteful number, since it uses less digits than its factorization.

20043551808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 789 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 20043551808 in words is "twenty billion, forty-three million, five hundred fifty-one thousand, eight hundred eight".