20312640243562 has 8 divisors (see below), whose sum is σ = 30475553965092. Its totient is φ = 10154122255200.

The previous prime is 20312640243551. The next prime is 20312640243569. The reversal of 20312640243562 is 26534204621302.

It can be written as a sum of positive squares in 2 ways, for example, as 18835348280841 + 1477291962721 = 4339971^2 + 1215439^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20312640243569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1098921739 + ... + 1098940222.

Almost surely, 2^{20312640243562} is an apocalyptic number.

20312640243562 is a deficient number, since it is larger than the sum of its proper divisors (10162913721530).

20312640243562 is a wasteful number, since it uses less digits than its factorization.

20312640243562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2197866584.

The product of its (nonzero) digits is 414720, while the sum is 40.

Adding to 20312640243562 its reverse (26534204621302), we get a palindrome (46846844864864).

The spelling of 20312640243562 in words is "twenty trillion, three hundred twelve billion, six hundred forty million, two hundred forty-three thousand, five hundred sixty-two".