217707855020 has 12 divisors (see below), whose sum is σ = 457186495584. Its totient is φ = 87083142000.

The previous prime is 217707855019. The next prime is 217707855031. The reversal of 217707855020 is 20558707712.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5442696356 + ... + 5442696395.

It is an arithmetic number, because the mean of its divisors is an integer number (38098874632).

Almost surely, 2^217707855020 is an apocalyptic number.

217707855020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217707855020 is an abundant number, since it is smaller than the sum of its proper divisors (239478640564).

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

217707855020 is a wasteful number, since it uses less digits than its factorization.

217707855020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10885392760 (or 10885392758 counting only the distinct ones).

The product of its (nonzero) digits is 274400, while the sum is 44.

The spelling of 217707855020 in words is "two hundred seventeen billion, seven hundred seven million, eight hundred fifty-five thousand, twenty".