20017182640 has 160 divisors (see below), whose sum is σ = 58136279040. Its totient is φ = 6240402432.

The previous prime is 20017182631. The next prime is 20017182643. The reversal of 20017182640 is 4628171002.

It is not an unprimeable number, because it can be changed into a prime (20017182643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 467241 + ... + 508279.

It is an arithmetic number, because the mean of its divisors is an integer number (363351744).

Almost surely, 2^20017182640 is an apocalyptic number.

20017182640 is a gapful number since it is divisible by the number (20) 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 20017182640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29068139520).

20017182640 is an abundant number, since it is smaller than the sum of its proper divisors (38119096400).

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

20017182640 is a wasteful number, since it uses less digits than its factorization.

20017182640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41139 (or 41133 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 31.

The spelling of 20017182640 in words is "twenty billion, seventeen million, one hundred eighty-two thousand, six hundred forty".