20402000002 has 16 divisors (see below), whose sum is σ = 30723443352. Its totient is φ = 10160916480.

The previous prime is 20401999997. The next prime is 20402000053. The reversal of 20402000002 is 20000020402.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 14757633361 + 5644366641 = 121481^2 + 75129^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 646102 + ... + 676942.

Almost surely, 2^20402000002 is an apocalyptic number.

20402000002 is a deficient number, since it is larger than the sum of its proper divisors (10321443350).

20402000002 is a wasteful number, since it uses less digits than its factorization.

20402000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32133.

The product of its (nonzero) digits is 32, while the sum is 10.

Adding to 20402000002 its reverse (20000020402), we get a palindrome (40402020404).

The spelling of 20402000002 in words is "twenty billion, four hundred two million, two", and thus it is an aban number.