20155611560 has 64 divisors (see below), whose sum is σ = 51949278720. Its totient is φ = 6894420480.

The previous prime is 20155611557. The next prime is 20155611571. The reversal of 20155611560 is 6511655102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37172 + ... + 204188.

It is an arithmetic number, because the mean of its divisors is an integer number (811707480).

Almost surely, 2^20155611560 is an apocalyptic number.

20155611560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20155611560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25974639360).

20155611560 is an abundant number, since it is smaller than the sum of its proper divisors (31793667160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20155611560 is a wasteful number, since it uses less digits than its factorization.

20155611560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167466 (or 167462 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 32.

The spelling of 20155611560 in words is "twenty billion, one hundred fifty-five million, six hundred eleven thousand, five hundred sixty".