20013656320 has 144 divisors (see below), whose sum is σ = 56677340160. Its totient is φ = 6625124352.

The previous prime is 20013656303. The next prime is 20013656323. The reversal of 20013656320 is 2365631002.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (20013656323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221329 + ... + 298351.

It is an arithmetic number, because the mean of its divisors is an integer number (393592640).

Almost surely, 2^20013656320 is an apocalyptic number.

20013656320 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 20013656320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28338670080).

20013656320 is an abundant number, since it is smaller than the sum of its proper divisors (36663683840).

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

20013656320 is an equidigital number, since it uses as much as digits as its factorization.

20013656320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77080 (or 77066 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The spelling of 20013656320 in words is "twenty billion, thirteen million, six hundred fifty-six thousand, three hundred twenty".