20155480999 has 4 divisors (see below), whose sum is σ = 20170974600. Its totient is φ = 20139987400.

The previous prime is 20155480979. The next prime is 20155481011. The reversal of 20155480999 is 99908455102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20155480999 - 2⁷ = 20155480871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20155480949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7744849 + ... + 7747450.

It is an arithmetic number, because the mean of its divisors is an integer number (5042743650).

Almost surely, 2^20155480999 is an apocalyptic number.

20155480999 is a deficient number, since it is larger than the sum of its proper divisors (15493601).

20155480999 is a wasteful number, since it uses less digits than its factorization.

20155480999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15493600.

The product of its (nonzero) digits is 1166400, while the sum is 52.

The spelling of 20155480999 in words is "twenty billion, one hundred fifty-five million, four hundred eighty thousand, nine hundred ninety-nine".