20862688642 has 8 divisors (see below), whose sum is σ = 31295422332. Its totient is φ = 10430881200.

The previous prime is 20862688633. The next prime is 20862688669. The reversal of 20862688642 is 24688626802.

It can be written as a sum of positive squares in 2 ways, for example, as 19993677201 + 869011441 = 141399^2 + 29479^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 20862688642.

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 3 ways as a sum of consecutive naturals, for example, 172209 + ... + 267172.

Almost surely, 2^20862688642 is an apocalyptic number.

20862688642 is a deficient number, since it is larger than the sum of its proper divisors (10432733690).

20862688642 is a wasteful number, since it uses less digits than its factorization.

20862688642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463124.

The product of its (nonzero) digits is 3538944, while the sum is 52.

The spelling of 20862688642 in words is "twenty billion, eight hundred sixty-two million, six hundred eighty-eight thousand, six hundred forty-two".