20420222424442 has 4 divisors (see below), whose sum is σ = 30630333636666. Its totient is φ = 10210111212220.

The previous prime is 20420222424391. The next prime is 20420222424449. The reversal of 20420222424442 is 24442422202402.

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., 13650593798241 + 6769628626201 = 3694671^2 + 2601851^2 .

It is a super-2 number, since 2×20420222424442² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20420222424398 and 20420222424407.

It is not an unprimeable number, because it can be changed into a prime (20420222424449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5105055606109 + ... + 5105055606112.

Almost surely, 2^{20420222424442} is an apocalyptic number.

20420222424442 is a deficient number, since it is larger than the sum of its proper divisors (10210111212224).

20420222424442 is a wasteful number, since it uses less digits than its factorization.

20420222424442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10210111212223.

The product of its (nonzero) digits is 131072, while the sum is 34.

Adding to 20420222424442 its reverse (24442422202402), we get a palindrome (44862644626844).

The spelling of 20420222424442 in words is "twenty trillion, four hundred twenty billion, two hundred twenty-two million, four hundred twenty-four thousand, four hundred forty-two".