20402404320 has 96 divisors (see below), whose sum is σ = 64396104192. Its totient is φ = 5429760512.

The previous prime is 20402404313. The next prime is 20402404333. The reversal of 20402404320 is 2340420402.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199189 + ... + 283691.

It is an arithmetic number, because the mean of its divisors is an integer number (670792752).

Almost surely, 2^20402404320 is an apocalyptic number.

20402404320 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 20402404320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32198052096).

20402404320 is an abundant number, since it is smaller than the sum of its proper divisors (43993699872).

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

20402404320 is a wasteful number, since it uses less digits than its factorization.

20402404320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85024 (or 85016 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

Adding to 20402404320 its reverse (2340420402), we get a palindrome (22742824722).

The spelling of 20402404320 in words is "twenty billion, four hundred two million, four hundred four thousand, three hundred twenty".