20123343242 has 4 divisors (see below), whose sum is σ = 30185014866. Its totient is φ = 10061671620.

The previous prime is 20123343239. The next prime is 20123343263. The reversal of 20123343242 is 24234332102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24234332102 = 2 ⋅12117166051.

It can be written as a sum of positive squares in only one way, i.e., 16723403761 + 3399939481 = 129319^2 + 58309^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5030835809 + ... + 5030835812.

Almost surely, 2^20123343242 is an apocalyptic number.

20123343242 is a deficient number, since it is larger than the sum of its proper divisors (10061671624).

20123343242 is a wasteful number, since it uses less digits than its factorization.

20123343242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10061671623.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 20123343242 its reverse (24234332102), we get a palindrome (44357675344).

The spelling of 20123343242 in words is "twenty billion, one hundred twenty-three million, three hundred forty-three thousand, two hundred forty-two".