20808217366 has 8 divisors (see below), whose sum is σ = 31243140864. Its totient is φ = 10393837080.

The previous prime is 20808217351. The next prime is 20808217399. The reversal of 20808217366 is 66371280802.

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

It is a congruent number.

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, 5133270 + ... + 5137321.

It is an arithmetic number, because the mean of its divisors is an integer number (3905392608).

Almost surely, 2^20808217366 is an apocalyptic number.

20808217366 is a deficient number, since it is larger than the sum of its proper divisors (10434923498).

20808217366 is a wasteful number, since it uses less digits than its factorization.

20808217366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271606.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 20808217366 in words is "twenty billion, eight hundred eight million, two hundred seventeen thousand, three hundred sixty-six".