20004321040 has 80 divisors (see below), whose sum is σ = 50795963136. Its totient is φ = 7266022400.

The previous prime is 20004321023. The next prime is 20004321041. The reversal of 20004321040 is 4012340002.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (20004321041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 789204 + ... + 814156.

Almost surely, 2^20004321040 is an apocalyptic number.

20004321040 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 20004321040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25397981568).

20004321040 is an abundant number, since it is smaller than the sum of its proper divisors (30791642096).

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

20004321040 is a wasteful number, since it uses less digits than its factorization.

20004321040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25888 (or 25882 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 20004321040 its reverse (4012340002), we get a palindrome (24016661042).

The spelling of 20004321040 in words is "twenty billion, four million, three hundred twenty-one thousand, forty".