20662189609 has 8 divisors (see below), whose sum is σ = 21272526920. Its totient is φ = 20054583936.

The previous prime is 20662189607. The next prime is 20662189621. The reversal of 20662189609 is 90698126602.

It can be written as a sum of positive squares in 4 ways, for example, as 17234438400 + 3427751209 = 131280^2 + 58547^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20662189609 - 2¹ = 20662189607 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20662189607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667554 + ... + 697819.

It is an arithmetic number, because the mean of its divisors is an integer number (2659065865).

Almost surely, 2^20662189609 is an apocalyptic number.

It is an amenable number.

20662189609 is a deficient number, since it is larger than the sum of its proper divisors (610337311).

20662189609 is a wasteful number, since it uses less digits than its factorization.

20662189609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365819.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 20662189609 in words is "twenty billion, six hundred sixty-two million, one hundred eighty-nine thousand, six hundred nine".