20400000234 has 16 divisors (see below), whose sum is σ = 41358905472. Its totient is φ = 6706849248.

The previous prime is 20400000211. The next prime is 20400000239. The reversal of 20400000234 is 43200000402.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20400000239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23287234 + ... + 23288109.

It is an arithmetic number, because the mean of its divisors is an integer number (2584931592).

Almost surely, 2^20400000234 is an apocalyptic number.

20400000234 is an abundant number, since it is smaller than the sum of its proper divisors (20958905238).

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

20400000234 is a wasteful number, since it uses less digits than its factorization.

20400000234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46575421.

The product of its (nonzero) digits is 192, while the sum is 15.

Adding to 20400000234 its reverse (43200000402), we get a palindrome (63600000636).

The spelling of 20400000234 in words is "twenty billion, four hundred million, two hundred thirty-four", and thus it is an aban number.