20111311242 has 48 divisors (see below), whose sum is σ = 47810681568. Its totient is φ = 6059099040.

The previous prime is 20111311229. The next prime is 20111311243. The reversal of 20111311242 is 24211311102.

20111311242 is a `hidden beast` number, since 2 + 0 + 111 + 311 + 242 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (20111311243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 259308 + ... + 327815.

It is an arithmetic number, because the mean of its divisors is an integer number (996055866).

Almost surely, 2^20111311242 is an apocalyptic number.

20111311242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

20111311242 is an abundant number, since it is smaller than the sum of its proper divisors (27699370326).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20111311242 is a wasteful number, since it uses less digits than its factorization.

20111311242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587315 (or 587312 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 20111311242 its reverse (24211311102), we get a palindrome (44322622344).

The spelling of 20111311242 in words is "twenty billion, one hundred eleven million, three hundred eleven thousand, two hundred forty-two".