20505220667 has 8 divisors (see below), whose sum is σ = 22079401200. Its totient is φ = 18971928064.

The previous prime is 20505220663. The next prime is 20505220669. The reversal of 20505220667 is 76602250502.

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 20505220667 - 2² = 20505220663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20505220663) 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, 10220942 + ... + 10222947.

It is an arithmetic number, because the mean of its divisors is an integer number (2759925150).

Almost surely, 2^20505220667 is an apocalyptic number.

20505220667 is a deficient number, since it is larger than the sum of its proper divisors (1574180533).

20505220667 is a wasteful number, since it uses less digits than its factorization.

20505220667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20443965.

The product of its (nonzero) digits is 50400, while the sum is 35.

The spelling of 20505220667 in words is "twenty billion, five hundred five million, two hundred twenty thousand, six hundred sixty-seven".