20003855505 has 8 divisors (see below), whose sum is σ = 32006168832. Its totient is φ = 10668722928.

The previous prime is 20003855483. The next prime is 20003855537. The reversal of 20003855505 is 50555830002.

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

It is not a de Polignac number, because 20003855505 - 2¹² = 20003851409 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 666795169 + ... + 666795198.

It is an arithmetic number, because the mean of its divisors is an integer number (4000771104).

Almost surely, 2^20003855505 is an apocalyptic number.

It is an amenable number.

20003855505 is a deficient number, since it is larger than the sum of its proper divisors (12002313327).

20003855505 is a wasteful number, since it uses less digits than its factorization.

20003855505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333590375.

The product of its (nonzero) digits is 30000, while the sum is 33.

The spelling of 20003855505 in words is "twenty billion, three million, eight hundred fifty-five thousand, five hundred five".