20402000000 has 168 divisors, whose sum is σ = 51313112715. Its totient is φ = 8080000000.

The previous prime is 20401999997. The next prime is 20402000053. The reversal of 20402000000 is 20402.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 11 ways, for example, as 6984947776 + 13417052224 = 83576^2 + 115832^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=101000.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 201999950 + ... + 202000050.

Almost surely, 2^20402000000 is an apocalyptic number.

20402000000 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 20402000000

20402000000 is an abundant number, since it is smaller than the sum of its proper divisors (30911112715).

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

20402000000 is an frugal number, since it uses more digits than its factorization.

20402000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246 (or 108 counting only the distinct ones).

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

Adding to 20402000000 its reverse (20402), we get a palindrome (20402020402).

Multiplying 20402000000 by its reverse (20402), we get a square (416241604000000 = 20402000²).

20402000000 divided by its reverse (20402) gives a 6-th power (1000000 = 10⁶).

The spelling of 20402000000 in words is "twenty billion, four hundred two million", and thus it is an aban number.