20015861760 has 468 divisors, whose sum is σ = 72324531396. Its totient is φ = 5119672320.

The previous prime is 20015861759. The next prime is 20015861773. The reversal of 20015861760 is 6716851002.

20015861760 is a `hidden beast` number, since 2 + 0 + 0 + 1 + 586 + 1 + 76 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2869530624 + 17146331136 = 53568^2 + 130944^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 177131464 + ... + 177131576.

It is an arithmetic number, because the mean of its divisors is an integer number (154539597).

Almost surely, 2^20015861760 is an apocalyptic number.

20015861760 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 20015861760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36162265698).

20015861760 is an abundant number, since it is smaller than the sum of its proper divisors (52308669636).

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

20015861760 is a wasteful number, since it uses less digits than its factorization.

20015861760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The spelling of 20015861760 in words is "twenty billion, fifteen million, eight hundred sixty-one thousand, seven hundred sixty".