20000402000 has 80 divisors (see below), whose sum is σ = 48573267600. Its totient is φ = 7965043200.

The previous prime is 20000401991. The next prime is 20000402057. The reversal of 20000402000 is 20400002.

It can be written as a sum of positive squares in 8 ways, for example, as 2780663824 + 17219738176 = 52732^2 + 131224^2 .

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 (8).

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, 436166 + ... + 479834.

It is an arithmetic number, because the mean of its divisors is an integer number (607165845).

Almost surely, 2^20000402000 is an apocalyptic number.

20000402000 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 20000402000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24286633800).

20000402000 is an abundant number, since it is smaller than the sum of its proper divisors (28572865600).

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

20000402000 is a wasteful number, since it uses less digits than its factorization.

20000402000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43921 (or 43905 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

Adding to 20000402000 its reverse (20400002), we get a palindrome (20020802002).

The spelling of 20000402000 in words is "twenty billion, four hundred two thousand".