20623643101 has 4 divisors (see below), whose sum is σ = 21103262752. Its totient is φ = 20144023452.

The previous prime is 20623643093. The next prime is 20623643111. The reversal of 20623643101 is 10134632602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20623643101 - 2³ = 20623643093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20623643101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20623643111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239809761 + ... + 239809846.

It is an arithmetic number, because the mean of its divisors is an integer number (5275815688).

Almost surely, 2^20623643101 is an apocalyptic number.

It is an amenable number.

20623643101 is a deficient number, since it is larger than the sum of its proper divisors (479619651).

20623643101 is an equidigital number, since it uses as much as digits as its factorization.

20623643101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479619650.

The product of its (nonzero) digits is 5184, while the sum is 28.

The spelling of 20623643101 in words is "twenty billion, six hundred twenty-three million, six hundred forty-three thousand, one hundred one".