20311610111 has 16 divisors (see below), whose sum is σ = 21991082400. Its totient is φ = 18649128960.

The previous prime is 20311610101. The next prime is 20311610113. The reversal of 20311610111 is 11101611302.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20311610111 is a prime.

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 20311610111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311610113) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1926791 + ... + 1937303.

It is an arithmetic number, because the mean of its divisors is an integer number (1374442650).

Almost surely, 2^20311610111 is an apocalyptic number.

20311610111 is a deficient number, since it is larger than the sum of its proper divisors (1679472289).

20311610111 is a wasteful number, since it uses less digits than its factorization.

20311610111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11306.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20311610111 in words is "twenty billion, three hundred eleven million, six hundred ten thousand, one hundred eleven".