20434392888 has 128 divisors (see below), whose sum is σ = 63021235200. Its totient is φ = 5376761856.

The previous prime is 20434392883. The next prime is 20434392911. The reversal of 20434392888 is 88829343402.

It is a happy number.

It is a super-2 number, since 2×20434392888² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20434392888.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20434392883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 948120 + ... + 969432.

It is an arithmetic number, because the mean of its divisors is an integer number (492353400).

Almost surely, 2^20434392888 is an apocalyptic number.

20434392888 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 20434392888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31510617600).

20434392888 is an abundant number, since it is smaller than the sum of its proper divisors (42586842312).

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

20434392888 is a wasteful number, since it uses less digits than its factorization.

20434392888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21781 (or 21777 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 51.

The spelling of 20434392888 in words is "twenty billion, four hundred thirty-four million, three hundred ninety-two thousand, eight hundred eighty-eight".