20187331495560 has 160 divisors (see below), whose sum is σ = 67883286101400. Its totient is φ = 5380795422720.

The previous prime is 20187331495559. The next prime is 20187331495633. The reversal of 20187331495560 is 6559413378102.

It is a happy number.

20187331495560 is a `hidden beast` number, since 2 + 0 + 1 + 8 + 7 + 3 + 31 + 49 + 5 + 560 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20185413581124 + 1917914436 = 4492818^2 + 43794^2 .

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 20187331495497 and 20187331495506.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 5560026 + ... + 8443254.

It is a 1-persistent number, because it is pandigital, but 2⋅20187331495560 = 40374662991120 is not.

Almost surely, 2^{20187331495560} is an apocalyptic number.

20187331495560 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 20187331495560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33941643050700).

20187331495560 is an abundant number, since it is smaller than the sum of its proper divisors (47695954605840).

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

20187331495560 is a wasteful number, since it uses less digits than its factorization.

20187331495560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885413 (or 2885400 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 20187331495560 in words is "twenty trillion, one hundred eighty-seven billion, three hundred thirty-one million, four hundred ninety-five thousand, five hundred sixty".