20198617907 has 16 divisors (see below), whose sum is σ = 23154516000. Its totient is φ = 17465082624.

The previous prime is 20198617891. The next prime is 20198617909. The reversal of 20198617907 is 70971689102.

It is a cyclic number.

It is not a de Polignac number, because 20198617907 - 2⁴ = 20198617891 is a prime.

It is a super-3 number, since 3×20198617907³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20198617909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 437432 + ... + 481397.

It is an arithmetic number, because the mean of its divisors is an integer number (1447157250).

Almost surely, 2^20198617907 is an apocalyptic number.

20198617907 is a deficient number, since it is larger than the sum of its proper divisors (2955898093).

20198617907 is a wasteful number, since it uses less digits than its factorization.

20198617907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918950.

The product of its (nonzero) digits is 381024, while the sum is 50.

The spelling of 20198617907 in words is "twenty billion, one hundred ninety-eight million, six hundred seventeen thousand, nine hundred seven".