20402203400 has 24 divisors (see below), whose sum is σ = 47435123370. Its totient is φ = 8160881280.

The previous prime is 20402203399. The next prime is 20402203403. The reversal of 20402203400 is 430220402.

It can be written as a sum of positive squares in 3 ways, for example, as 16857906244 + 3544297156 = 129838^2 + 59534^2 .

It is not an unprimeable number, because it can be changed into a prime (20402203403) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 51005309 + ... + 51005708.

Almost surely, 2^20402203400 is an apocalyptic number.

20402203400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20402203400 is an abundant number, since it is smaller than the sum of its proper divisors (27032919970).

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

20402203400 is a wasteful number, since it uses less digits than its factorization.

20402203400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102011033 (or 102011024 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 17.

Adding to 20402203400 its reverse (430220402), we get a palindrome (20832423802).

The spelling of 20402203400 in words is "twenty billion, four hundred two million, two hundred three thousand, four hundred".