20643914755 has 8 divisors (see below), whose sum is σ = 24773918832. Its totient is φ = 16514317728.

The previous prime is 20643914747. The next prime is 20643914821. The reversal of 20643914755 is 55741934602.

It is a happy number.

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 20643914755 - 2³ = 20643914747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23932 + ... + 204598.

It is an arithmetic number, because the mean of its divisors is an integer number (3096739854).

Almost surely, 2^20643914755 is an apocalyptic number.

20643914755 is a deficient number, since it is larger than the sum of its proper divisors (4130004077).

20643914755 is a wasteful number, since it uses less digits than its factorization.

20643914755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203525.

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 20643914755 in words is "twenty billion, six hundred forty-three million, nine hundred fourteen thousand, seven hundred fifty-five".