20398236209 has 8 divisors (see below), whose sum is σ = 22098874560. Its totient is φ = 18716389776.

The previous prime is 20398236179. The next prime is 20398236223. The reversal of 20398236209 is 90263289302.

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 20398236209 - 2⁸ = 20398235953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20398236209.

It is not an unprimeable number, because it can be changed into a prime (20398236109) 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, 4695719 + ... + 4700060.

It is an arithmetic number, because the mean of its divisors is an integer number (2762359320).

Almost surely, 2^20398236209 is an apocalyptic number.

It is an amenable number.

20398236209 is a deficient number, since it is larger than the sum of its proper divisors (1700638351).

20398236209 is a wasteful number, since it uses less digits than its factorization.

20398236209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9395959.

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 20398236209 in words is "twenty billion, three hundred ninety-eight million, two hundred thirty-six thousand, two hundred nine".