20404254808 has 64 divisors (see below), whose sum is σ = 45256273920. Its totient is φ = 8439638400.

The previous prime is 20404254781. The next prime is 20404254809. The reversal of 20404254808 is 80845240402.

It is a super-2 number, since 2×20404254808² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20404254809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 631773 + ... + 663283.

It is an arithmetic number, because the mean of its divisors is an integer number (707129280).

Almost surely, 2^20404254808 is an apocalyptic number.

20404254808 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 20404254808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22628136960).

20404254808 is an abundant number, since it is smaller than the sum of its proper divisors (24852019112).

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

20404254808 is a wasteful number, since it uses less digits than its factorization.

20404254808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31928 (or 31924 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 37.

The spelling of 20404254808 in words is "twenty billion, four hundred four million, two hundred fifty-four thousand, eight hundred eight".