20340043400 has 48 divisors (see below), whose sum is σ = 49779589200. Its totient is φ = 7707804480.

The previous prime is 20340043351. The next prime is 20340043421. The reversal of 20340043400 is 434004302.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2672522 + ... + 2680121.

It is an arithmetic number, because the mean of its divisors is an integer number (1037074775).

Almost surely, 2^20340043400 is an apocalyptic number.

20340043400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20340043400 is an abundant number, since it is smaller than the sum of its proper divisors (29439545800).

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

20340043400 is a wasteful number, since it uses less digits than its factorization.

20340043400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5352678 (or 5352669 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

Adding to 20340043400 its reverse (434004302), we get a palindrome (20774047702).

The spelling of 20340043400 in words is "twenty billion, three hundred forty million, forty-three thousand, four hundred".