20123442242 has 4 divisors (see below), whose sum is σ = 30185163366. Its totient is φ = 10061721120.

The previous prime is 20123442223. The next prime is 20123442271. The reversal of 20123442242 is 24224432102.

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., 12494991961 + 7628450281 = 111781^2 + 87341^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5030860559 + ... + 5030860562.

Almost surely, 2^20123442242 is an apocalyptic number.

20123442242 is a deficient number, since it is larger than the sum of its proper divisors (10061721124).

20123442242 is a wasteful number, since it uses less digits than its factorization.

20123442242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10061721123.

The product of its (nonzero) digits is 6144, while the sum is 26.

Adding to 20123442242 its reverse (24224432102), we get a palindrome (44347874344).

The spelling of 20123442242 in words is "twenty billion, one hundred twenty-three million, four hundred forty-two thousand, two hundred forty-two".