20002120009 has 8 divisors (see below), whose sum is σ = 20191726368. Its totient is φ = 19813073280.

The previous prime is 20002120001. The next prime is 20002120121. The reversal of 20002120009 is 90002120002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20002120009 - 2³ = 20002120001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002119974 and 20002120001.

It is not an unprimeable number, because it can be changed into a prime (20002120001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67912 + ... + 211225.

It is an arithmetic number, because the mean of its divisors is an integer number (2523965796).

Almost surely, 2^20002120009 is an apocalyptic number.

It is an amenable number.

20002120009 is a deficient number, since it is larger than the sum of its proper divisors (189606359).

20002120009 is a wasteful number, since it uses less digits than its factorization.

20002120009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279815.

The product of its (nonzero) digits is 72, while the sum is 16.

The spelling of 20002120009 in words is "twenty billion, two million, one hundred twenty thousand, nine".