20055011505 has 32 divisors (see below), whose sum is σ = 33576913920. Its totient is φ = 10209162240.

The previous prime is 20055011497. The next prime is 20055011507. The reversal of 20055011505 is 50511055002.

It is not a de Polignac number, because 20055011505 - 2³ = 20055011497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20055011507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 261460 + ... + 329349.

It is an arithmetic number, because the mean of its divisors is an integer number (1049278560).

Almost surely, 2^20055011505 is an apocalyptic number.

It is an amenable number.

20055011505 is a deficient number, since it is larger than the sum of its proper divisors (13521902415).

20055011505 is a wasteful number, since it uses less digits than its factorization.

20055011505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590921.

The product of its (nonzero) digits is 1250, while the sum is 24.

Adding to 20055011505 its reverse (50511055002), we get a palindrome (70566066507).

It can be divided in two parts, 2005501 and 1505, that added together give a triangular number (2007006 = T₂₀₀₃).

The spelling of 20055011505 in words is "twenty billion, fifty-five million, eleven thousand, five hundred five".