12423400020 has 144 divisors (see below), whose sum is σ = 38629543680. Its totient is φ = 3230339328.

The previous prime is 12423400019. The next prime is 12423400051. The reversal of 12423400020 is 2000432421.

12423400020 is a `hidden beast` number, since 1 + 242 + 3 + 400 + 0 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12423399966 and 12423400002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2391586 + ... + 2396774.

It is an arithmetic number, because the mean of its divisors is an integer number (268260720).

Almost surely, 2^12423400020 is an apocalyptic number.

12423400020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12423400020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19314771840).

12423400020 is an abundant number, since it is smaller than the sum of its proper divisors (26206143660).

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

12423400020 is a wasteful number, since it uses less digits than its factorization.

12423400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5534 (or 5529 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 12423400020 its reverse (2000432421), we get a palindrome (14423832441).

The spelling of 12423400020 in words is "twelve billion, four hundred twenty-three million, four hundred thousand, twenty".