20423131242 has 16 divisors (see below), whose sum is σ = 40963979232. Its totient is φ = 6788090960.

The previous prime is 20423131231. The next prime is 20423131279. The reversal of 20423131242 is 24213132402.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4902609 + ... + 4906772.

It is an arithmetic number, because the mean of its divisors is an integer number (2560248702).

Almost surely, 2^20423131242 is an apocalyptic number.

20423131242 is an abundant number, since it is smaller than the sum of its proper divisors (20540847990).

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

20423131242 is a wasteful number, since it uses less digits than its factorization.

20423131242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9809733.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 20423131242 its reverse (24213132402), we get a palindrome (44636263644).

The spelling of 20423131242 in words is "twenty billion, four hundred twenty-three million, one hundred thirty-one thousand, two hundred forty-two".