20816901541 has 16 divisors (see below), whose sum is σ = 21494382208. Its totient is φ = 20150856000.

The previous prime is 20816901499. The next prime is 20816901551. The reversal of 20816901541 is 14510961802.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20816901541 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 20816901541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20816901551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6304591 + ... + 6307891.

It is an arithmetic number, because the mean of its divisors is an integer number (1343398888).

Almost surely, 2^20816901541 is an apocalyptic number.

It is an amenable number.

20816901541 is a deficient number, since it is larger than the sum of its proper divisors (677480667).

20816901541 is a wasteful number, since it uses less digits than its factorization.

20816901541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4972.

The product of its (nonzero) digits is 17280, while the sum is 37.

The spelling of 20816901541 in words is "twenty billion, eight hundred sixteen million, nine hundred one thousand, five hundred forty-one".