20012111009 has 16 divisors (see below), whose sum is σ = 22787291520. Its totient is φ = 17396712960.

The previous prime is 20012110991. The next prime is 20012111023. The reversal of 20012111009 is 90011121002.

It is not a de Polignac number, because 20012111009 - 2²⁴ = 19995333793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20012111089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1035059 + ... + 1054215.

It is an arithmetic number, because the mean of its divisors is an integer number (1424205720).

Almost surely, 2^20012111009 is an apocalyptic number.

It is an amenable number.

20012111009 is a deficient number, since it is larger than the sum of its proper divisors (2775180511).

20012111009 is a wasteful number, since it uses less digits than its factorization.

20012111009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23320.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 20012111009 in words is "twenty billion, twelve million, one hundred eleven thousand, nine".