16820317220 has 72 divisors (see below), whose sum is σ = 42876195264. Its totient is φ = 5516220864.

The previous prime is 16820317211. The next prime is 16820317229. The reversal of 16820317220 is 2271302861.

It is an interprime number because it is at equal distance from previous prime (16820317211) and next prime (16820317229).

It is a super-3 number, since 3×16820317220³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16820317229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 350582 + ... + 395661.

It is an arithmetic number, because the mean of its divisors is an integer number (595502712).

Almost surely, 2^16820317220 is an apocalyptic number.

16820317220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16820317220 is an abundant number, since it is smaller than the sum of its proper divisors (26055878044).

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

16820317220 is a wasteful number, since it uses less digits than its factorization.

16820317220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746289 (or 746280 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 16820317220 in words is "sixteen billion, eight hundred twenty million, three hundred seventeen thousand, two hundred twenty".