20522340242 has 4 divisors (see below), whose sum is σ = 30783510366. Its totient is φ = 10261170120.

The previous prime is 20522340229. The next prime is 20522340247. The reversal of 20522340242 is 24204322502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24204322502 = 2 ⋅12102161251.

It can be written as a sum of positive squares in only one way, i.e., 13181106481 + 7341233761 = 114809^2 + 85681^2 .

It is not an unprimeable number, because it can be changed into a prime (20522340247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5130585059 + ... + 5130585062.

Almost surely, 2^20522340242 is an apocalyptic number.

20522340242 is a deficient number, since it is larger than the sum of its proper divisors (10261170124).

20522340242 is a wasteful number, since it uses less digits than its factorization.

20522340242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10261170123.

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 20522340242 its reverse (24204322502), we get a palindrome (44726662744).

The spelling of 20522340242 in words is "twenty billion, five hundred twenty-two million, three hundred forty thousand, two hundred forty-two".