20000400002 has 18 divisors (see below), whose sum is σ = 32979493827. Its totient is φ = 9090090900.

The previous prime is 20000399999. The next prime is 20000400019.

Added to its reverse (20000400002) it gives a square (40000800004 = 200002²).

20000400002 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 10000200001 + 10000200001 = 100001^2 + 100001^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=100001.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2195477 + ... + 2204567.

Almost surely, 2^20000400002 is an apocalyptic number.

20000400002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20000400002 is a deficient number, since it is larger than the sum of its proper divisors (12979093825).

20000400002 is an frugal number, since it uses more digits than its factorization.

20000400002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18206 (or 9104 counting only the distinct ones).

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

The spelling of 20000400002 in words is "twenty billion, four hundred thousand, two".