20400322124 has 48 divisors (see below), whose sum is σ = 44079782208. Its totient is φ = 8044627968.

The previous prime is 20400322057. The next prime is 20400322127. The reversal of 20400322124 is 42122300402.

It is a junction number, because it is equal to n+sod(n) for n = 20400322096 and 20400322105.

It is not an unprimeable number, because it can be changed into a prime (20400322127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24404 + ... + 203460.

It is an arithmetic number, because the mean of its divisors is an integer number (918328796).

Almost surely, 2^20400322124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20400322124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22039891104).

20400322124 is an abundant number, since it is smaller than the sum of its proper divisors (23679460084).

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

20400322124 is a wasteful number, since it uses less digits than its factorization.

20400322124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179394 (or 179392 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 20400322124 its reverse (42122300402), we get a palindrome (62522622526).

The spelling of 20400322124 in words is "twenty billion, four hundred million, three hundred twenty-two thousand, one hundred twenty-four".