20400323234 has 4 divisors (see below), whose sum is σ = 30600484854. Its totient is φ = 10200161616.

The previous prime is 20400323231. The next prime is 20400323291. The reversal of 20400323234 is 43232300402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 18332347609 + 2067975625 = 135397^2 + 45475^2 .

It is not an unprimeable number, because it can be changed into a prime (20400323231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5100080807 + ... + 5100080810.

Almost surely, 2^20400323234 is an apocalyptic number.

20400323234 is a deficient number, since it is larger than the sum of its proper divisors (10200161620).

20400323234 is a wasteful number, since it uses less digits than its factorization.

20400323234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10200161619.

The product of its (nonzero) digits is 3456, while the sum is 23.

Adding to 20400323234 its reverse (43232300402), we get a palindrome (63632623636).

The spelling of 20400323234 in words is "twenty billion, four hundred million, three hundred twenty-three thousand, two hundred thirty-four".