20423442340 has 192 divisors, whose sum is σ = 51211657728. Its totient is φ = 6697267200.

The previous prime is 20423442293. The next prime is 20423442341. The reversal of 20423442340 is 4324432402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 20423442299 and 20423442308.

It is not an unprimeable number, because it can be changed into a prime (20423442341) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 118054494 + ... + 118054666.

It is an arithmetic number, because the mean of its divisors is an integer number (266727384).

Almost surely, 2^20423442340 is an apocalyptic number.

20423442340 is a gapful number since it is divisible by the number (20) 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 20423442340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25605828864).

20423442340 is an abundant number, since it is smaller than the sum of its proper divisors (30788215388).

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

20423442340 is a wasteful number, since it uses less digits than its factorization.

20423442340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 516 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 28.

Adding to 20423442340 its reverse (4324432402), we get a palindrome (24747874742).

The spelling of 20423442340 in words is "twenty billion, four hundred twenty-three million, four hundred forty-two thousand, three hundred forty".