20180616720 has 320 divisors, whose sum is σ = 69318063360. Its totient is φ = 4816281600.

The previous prime is 20180616707. The next prime is 20180616721. The reversal of 20180616720 is 2761608102.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (20180616721) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 75020746 + ... + 75021014.

It is an arithmetic number, because the mean of its divisors is an integer number (216618948).

Almost surely, 2^20180616720 is an apocalyptic number.

20180616720 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 20180616720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34659031680).

20180616720 is an abundant number, since it is smaller than the sum of its proper divisors (49137446640).

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

20180616720 is a wasteful number, since it uses less digits than its factorization.

20180616720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The spelling of 20180616720 in words is "twenty billion, one hundred eighty million, six hundred sixteen thousand, seven hundred twenty".