20055515505 has 16 divisors (see below), whose sum is σ = 33483991680. Its totient is φ = 10231219328.

The previous prime is 20055515453. The next prime is 20055515507. The reversal of 20055515505 is 50551555002.

It is a cyclic number.

It is not a de Polignac number, because 20055515505 - 2²⁵ = 20021961073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20055515507) 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, 29065620 + ... + 29066309.

It is an arithmetic number, because the mean of its divisors is an integer number (2092749480).

Almost surely, 2^20055515505 is an apocalyptic number.

It is an amenable number.

20055515505 is a deficient number, since it is larger than the sum of its proper divisors (13428476175).

20055515505 is a wasteful number, since it uses less digits than its factorization.

20055515505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58131960.

The product of its (nonzero) digits is 31250, while the sum is 33.

The spelling of 20055515505 in words is "twenty billion, fifty-five million, five hundred fifteen thousand, five hundred five".