20400343122 has 16 divisors (see below), whose sum is σ = 40911864192. Its totient is φ = 6781584720.

The previous prime is 20400343079. The next prime is 20400343123. The reversal of 20400343122 is 22134300402.

It is not an unprimeable number, because it can be changed into a prime (20400343123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4630029 + ... + 4634432.

It is an arithmetic number, because the mean of its divisors is an integer number (2556991512).

Almost surely, 2^20400343122 is an apocalyptic number.

20400343122 is an abundant number, since it is smaller than the sum of its proper divisors (20511521070).

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

20400343122 is a wasteful number, since it uses less digits than its factorization.

20400343122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9264833.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 20400343122 its reverse (22134300402), we get a palindrome (42534643524).

The spelling of 20400343122 in words is "twenty billion, four hundred million, three hundred forty-three thousand, one hundred twenty-two".