20355242111 has 16 divisors (see below), whose sum is σ = 21624746400. Its totient is φ = 19093874688.

The previous prime is 20355242099. The next prime is 20355242137. The reversal of 20355242111 is 11124255302.

It is a cyclic number.

It is not a de Polignac number, because 20355242111 - 2¹⁴ = 20355225727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20355244111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8969885 + ... + 8972153.

It is an arithmetic number, because the mean of its divisors is an integer number (1351546650).

Almost surely, 2^20355242111 is an apocalyptic number.

20355242111 is a deficient number, since it is larger than the sum of its proper divisors (1269504289).

20355242111 is a wasteful number, since it uses less digits than its factorization.

20355242111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3818.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 20355242111 its reverse (11124255302), we get a palindrome (31479497413).

The spelling of 20355242111 in words is "twenty billion, three hundred fifty-five million, two hundred forty-two thousand, one hundred eleven".