20111918237 has 2 divisors, whose sum is σ = 20111918238. Its totient is φ = 20111918236.

The previous prime is 20111918219. The next prime is 20111918257. The reversal of 20111918237 is 73281911102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19776515641 + 335402596 = 140629^2 + 18314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20111918237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20111918197 and 20111918206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111918257) 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 as a sum of consecutive naturals, namely, 10055959118 + 10055959119.

It is an arithmetic number, because the mean of its divisors is an integer number (10055959119).

Almost surely, 2^20111918237 is an apocalyptic number.

It is an amenable number.

20111918237 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111918237 is an equidigital number, since it uses as much as digits as its factorization.

20111918237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 35.

The spelling of 20111918237 in words is "twenty billion, one hundred eleven million, nine hundred eighteen thousand, two hundred thirty-seven".