20201001909 has 12 divisors (see below), whose sum is σ = 29605876608. Its totient is φ = 12243031240.

The previous prime is 20201001857. The next prime is 20201001941. The reversal of 20201001909 is 90910010202.

It is not a de Polignac number, because 20201001909 - 2¹³ = 20200993717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201001979) 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 in 11 ways as a sum of consecutive naturals, for example, 27824709 + ... + 27825434.

It is an arithmetic number, because the mean of its divisors is an integer number (2467156384).

Almost surely, 2^20201001909 is an apocalyptic number.

It is an amenable number.

20201001909 is a deficient number, since it is larger than the sum of its proper divisors (9404874699).

20201001909 is a wasteful number, since it uses less digits than its factorization.

20201001909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55650168 (or 55650157 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 24.

The spelling of 20201001909 in words is "twenty billion, two hundred one million, one thousand, nine hundred nine".