20108181019 has 4 divisors (see below), whose sum is σ = 20114541496. Its totient is φ = 20101820544.

The previous prime is 20108181017. The next prime is 20108181059. The reversal of 20108181019 is 91018180102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20108181019 - 2¹ = 20108181017 is a prime.

It is a super-2 number, since 2×20108181019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20108181011) 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 3 ways as a sum of consecutive naturals, for example, 3175494 + ... + 3181819.

It is an arithmetic number, because the mean of its divisors is an integer number (5028635374).

Almost surely, 2^20108181019 is an apocalyptic number.

20108181019 is a deficient number, since it is larger than the sum of its proper divisors (6360477).

20108181019 is an equidigital number, since it uses as much as digits as its factorization.

20108181019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6360476.

The product of its (nonzero) digits is 1152, while the sum is 31.

The spelling of 20108181019 in words is "twenty billion, one hundred eight million, one hundred eighty-one thousand, nineteen".