20512331242 has 16 divisors (see below), whose sum is σ = 33943484232. Its totient is φ = 9236321280.

The previous prime is 20512331227. The next prime is 20512331299. The reversal of 20512331242 is 24213321502.

It can be written as a sum of positive squares in 4 ways, for example, as 3847844961 + 16664486281 = 62031^2 + 129091^2 .

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 9620103 + ... + 9622234.

Almost surely, 2^20512331242 is an apocalyptic number.

20512331242 is a deficient number, since it is larger than the sum of its proper divisors (13431152990).

20512331242 is a wasteful number, since it uses less digits than its factorization.

20512331242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19242393.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 20512331242 its reverse (24213321502), we get a palindrome (44725652744).

The spelling of 20512331242 in words is "twenty billion, five hundred twelve million, three hundred thirty-one thousand, two hundred forty-two".