20021836705 has 8 divisors (see below), whose sum is σ = 25874373672. Its totient is φ = 14785356288.

The previous prime is 20021836643. The next prime is 20021836781. The reversal of 20021836705 is 50763812002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4239442321 + 15782394384 = 65111^2 + 125628^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20021836705 - 2¹³ = 20021828513 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154014064 + ... + 154014193.

It is an arithmetic number, because the mean of its divisors is an integer number (3234296709).

Almost surely, 2^20021836705 is an apocalyptic number.

It is an amenable number.

20021836705 is a deficient number, since it is larger than the sum of its proper divisors (5852536967).

20021836705 is a wasteful number, since it uses less digits than its factorization.

20021836705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308028275.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20021836705 in words is "twenty billion, twenty-one million, eight hundred thirty-six thousand, seven hundred five".