20662634642 has 16 divisors (see below), whose sum is σ = 33383884632. Its totient is φ = 9534948480.

The previous prime is 20662634579. The next prime is 20662634701. The reversal of 20662634642 is 24643626602.

It can be written as a sum of positive squares in 4 ways, for example, as 9015692401 + 11646942241 = 94951^2 + 107921^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20662634642.

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, 91142 + ... + 222782.

Almost surely, 2^20662634642 is an apocalyptic number.

20662634642 is a deficient number, since it is larger than the sum of its proper divisors (12721249990).

20662634642 is a wasteful number, since it uses less digits than its factorization.

20662634642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137693.

The product of its (nonzero) digits is 497664, while the sum is 41.

The spelling of 20662634642 in words is "twenty billion, six hundred sixty-two million, six hundred thirty-four thousand, six hundred forty-two".