20205221135 has 8 divisors (see below), whose sum is σ = 26450471376. Its totient is φ = 14694706240.

The previous prime is 20205221131. The next prime is 20205221149. The reversal of 20205221135 is 53112250202.

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

It is not a de Polignac number, because 20205221135 - 2² = 20205221131 is a prime.

It is a super-2 number, since 2×20205221135² (a number of 21 digits) contains 22 as substring.

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 20205221135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20205221131) 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 7 ways as a sum of consecutive naturals, for example, 183683774 + ... + 183683883.

It is an arithmetic number, because the mean of its divisors is an integer number (3306308922).

Almost surely, 2^20205221135 is an apocalyptic number.

20205221135 is a deficient number, since it is larger than the sum of its proper divisors (6245250241).

20205221135 is a wasteful number, since it uses less digits than its factorization.

20205221135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367367673.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 20205221135 its reverse (53112250202), we get a palindrome (73317471337).

The spelling of 20205221135 in words is "twenty billion, two hundred five million, two hundred twenty-one thousand, one hundred thirty-five".