20199999955 has 8 divisors (see below), whose sum is σ = 24251627232. Its totient is φ = 16152248448.

The previous prime is 20199999949. The next prime is 20199999959. The reversal of 20199999955 is 55999999102.

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 20199999955 - 2⁵ = 20199999923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20199999959) 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, 957462 + ... + 978331.

It is an arithmetic number, because the mean of its divisors is an integer number (3031453404).

Almost surely, 2^20199999955 is an apocalyptic number.

20199999955 is a deficient number, since it is larger than the sum of its proper divisors (4051627277).

20199999955 is a wasteful number, since it uses less digits than its factorization.

20199999955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1937885.

The product of its (nonzero) digits is 26572050, while the sum is 67.

The spelling of 20199999955 in words is "twenty billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-five".