20018639411 has 2 divisors, whose sum is σ = 20018639412. Its totient is φ = 20018639410.

The previous prime is 20018639383. The next prime is 20018639447. The reversal of 20018639411 is 11493681002.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20018639411 is a prime.

It is not a weakly prime, because it can be changed into another prime (20018639461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10009319705 + 10009319706.

It is an arithmetic number, because the mean of its divisors is an integer number (10009319706).

Almost surely, 2^20018639411 is an apocalyptic number.

20018639411 is a deficient number, since it is larger than the sum of its proper divisors (1).

20018639411 is an equidigital number, since it uses as much as digits as its factorization.

20018639411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 20018639411 in words is "twenty billion, eighteen million, six hundred thirty-nine thousand, four hundred eleven".