20400200001 has 10 divisors (see below), whose sum is σ = 30474372962. Its totient is φ = 13600133280.

The previous prime is 20400199987. The next prime is 20400200011. The reversal of 20400200001 is 10000200402.

It can be written as a sum of positive squares in only one way, i.e., 20374707600 + 25492401 = 142740^2 + 5049^2 .

It is not a de Polignac number, because 20400200001 - 2⁹ = 20400199489 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20400200011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 125927080 + ... + 125927241.

Almost surely, 2^20400200001 is an apocalyptic number.

It is an amenable number.

20400200001 is a deficient number, since it is larger than the sum of its proper divisors (10074172961).

20400200001 is an equidigital number, since it uses as much as digits as its factorization.

20400200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251854333 (or 251854324 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 20400200001 its reverse (10000200402), we get a palindrome (30400400403).

The spelling of 20400200001 in words is "twenty billion, four hundred million, two hundred thousand, one".