20660464442 has 8 divisors (see below), whose sum is σ = 31050181332. Its totient is φ = 10310404000.

The previous prime is 20660464411. The next prime is 20660464459. The reversal of 20660464442 is 24446406602.

It can be written as a sum of positive squares in 2 ways, for example, as 20581058521 + 79405921 = 143461^2 + 8911^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 20660464396 and 20660464405.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9912809 + ... + 9914892.

Almost surely, 2^20660464442 is an apocalyptic number.

20660464442 is a deficient number, since it is larger than the sum of its proper divisors (10389716890).

20660464442 is a wasteful number, since it uses less digits than its factorization.

20660464442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19828224.

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 20660464442 in words is "twenty billion, six hundred sixty million, four hundred sixty-four thousand, four hundred forty-two".