20944821115 has 4 divisors (see below), whose sum is σ = 25133785344. Its totient is φ = 16755856888.

The previous prime is 20944821113. The next prime is 20944821137. The reversal of 20944821115 is 51112844902.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20944821115 - 2¹ = 20944821113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20944821113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2094482107 + ... + 2094482116.

It is an arithmetic number, because the mean of its divisors is an integer number (6283446336).

Almost surely, 2^20944821115 is an apocalyptic number.

20944821115 is a deficient number, since it is larger than the sum of its proper divisors (4188964229).

20944821115 is an equidigital number, since it uses as much as digits as its factorization.

20944821115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4188964228.

The product of its (nonzero) digits is 23040, while the sum is 37.

The spelling of 20944821115 in words is "twenty billion, nine hundred forty-four million, eight hundred twenty-one thousand, one hundred fifteen".