20020402400 has 72 divisors (see below), whose sum is σ = 48991723704. Its totient is φ = 7989004800.

The previous prime is 20020402399. The next prime is 20020402403. The reversal of 20020402400 is 420402002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020402403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307079 + ... + 366521.

It is an arithmetic number, because the mean of its divisors is an integer number (680440607).

Almost surely, 2^20020402400 is an apocalyptic number.

20020402400 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 20020402400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24495861852).

20020402400 is an abundant number, since it is smaller than the sum of its proper divisors (28971321304).

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

20020402400 is a wasteful number, since it uses less digits than its factorization.

20020402400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59884 (or 59871 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 14.

Adding to 20020402400 its reverse (420402002), we get a palindrome (20440804402).

The spelling of 20020402400 in words is "twenty billion, twenty million, four hundred two thousand, four hundred".