20186620440 has 256 divisors, whose sum is σ = 72410112000. Its totient is φ = 4404449280.

The previous prime is 20186620423. The next prime is 20186620451. The reversal of 20186620440 is 4402668102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2163385 + ... + 2172695.

It is an arithmetic number, because the mean of its divisors is an integer number (282852000).

Almost surely, 2^20186620440 is an apocalyptic number.

20186620440 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 20186620440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36205056000).

20186620440 is an abundant number, since it is smaller than the sum of its proper divisors (52223491560).

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

20186620440 is a wasteful number, since it uses less digits than its factorization.

20186620440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450 (or 9446 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The spelling of 20186620440 in words is "twenty billion, one hundred eighty-six million, six hundred twenty thousand, four hundred forty".