20212643105 has 8 divisors (see below), whose sum is σ = 24652797864. Its totient is φ = 15905030400.

The previous prime is 20212643071. The next prime is 20212643107. The reversal of 20212643105 is 50134621202.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1274204416 + 18938438689 = 35696^2 + 137617^2 .

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

It is not a de Polignac number, because 20212643105 - 2²⁴ = 20195865889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20212643107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33135176 + ... + 33135785.

It is an arithmetic number, because the mean of its divisors is an integer number (3081599733).

Almost surely, 2^20212643105 is an apocalyptic number.

It is an amenable number.

20212643105 is a deficient number, since it is larger than the sum of its proper divisors (4440154759).

20212643105 is an equidigital number, since it uses as much as digits as its factorization.

20212643105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66271027.

The product of its (nonzero) digits is 2880, while the sum is 26.

The spelling of 20212643105 in words is "twenty billion, two hundred twelve million, six hundred forty-three thousand, one hundred five".