20501220611 has 8 divisors (see below), whose sum is σ = 21135022944. Its totient is φ = 19873788480.

The previous prime is 20501220587. The next prime is 20501220667. The reversal of 20501220611 is 11602210502.

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

It is a de Polignac number, because none of the positive numbers 2^k-20501220611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20501220671) 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 7 ways as a sum of consecutive naturals, for example, 1586015 + ... + 1598888.

It is an arithmetic number, because the mean of its divisors is an integer number (2641877868).

Almost surely, 2^20501220611 is an apocalyptic number.

20501220611 is a deficient number, since it is larger than the sum of its proper divisors (633802333).

20501220611 is a wasteful number, since it uses less digits than its factorization.

20501220611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3185101.

The product of its (nonzero) digits is 240, while the sum is 20.

The spelling of 20501220611 in words is "twenty billion, five hundred one million, two hundred twenty thousand, six hundred eleven".