20217820168 has 48 divisors (see below), whose sum is σ = 46912884480. Its totient is φ = 7998254784.

The previous prime is 20217820159. The next prime is 20217820169. The reversal of 20217820168 is 86102871202.

It is not an unprimeable number, because it can be changed into a prime (20217820169) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1058680 + ... + 1077607.

It is an arithmetic number, because the mean of its divisors is an integer number (977351760).

Almost surely, 2^20217820168 is an apocalyptic number.

20217820168 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20217820168 is an abundant number, since it is smaller than the sum of its proper divisors (26695064312).

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

20217820168 is a wasteful number, since it uses less digits than its factorization.

20217820168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136326 (or 2136309 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The spelling of 20217820168 in words is "twenty billion, two hundred seventeen million, eight hundred twenty thousand, one hundred sixty-eight".