20019090909 has 8 divisors (see below), whose sum is σ = 26719059712. Its totient is φ = 13332591360.

The previous prime is 20019090863. The next prime is 20019090913. The reversal of 20019090909 is 90909091002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20019090909 - 2⁷ = 20019090781 is a prime.

It is a Duffinian number.

20019090909 is a modest number, since divided by 90909 gives 20019 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20019090709) 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 7 ways as a sum of consecutive naturals, for example, 3363844 + ... + 3369789.

It is an arithmetic number, because the mean of its divisors is an integer number (3339882464).

Almost surely, 2^20019090909 is an apocalyptic number.

It is an amenable number.

20019090909 is a deficient number, since it is larger than the sum of its proper divisors (6699968803).

20019090909 is an equidigital number, since it uses as much as digits as its factorization.

20019090909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6734627.

The product of its (nonzero) digits is 13122, while the sum is 39.

The spelling of 20019090909 in words is "twenty billion, nineteen million, ninety thousand, nine hundred nine".