217203980 has 48 divisors (see below), whose sum is σ = 538116096. Its totient is φ = 72066240.

The previous prime is 217203979. The next prime is 217203983. The reversal of 217203980 is 89302712.

217203980 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (217203983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20684 + ... + 29363.

It is an arithmetic number, because the mean of its divisors is an integer number (11210752).

Almost surely, 2^217203980 is an apocalyptic number.

217203980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217203980 is an abundant number, since it is smaller than the sum of its proper divisors (320912116).

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

217203980 is a wasteful number, since it uses less digits than its factorization.

217203980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50094 (or 50092 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 217203980 is about 14737.8417687258. The cubic root of 217203980 is about 601.1127314020.

The spelling of 217203980 in words is "two hundred seventeen million, two hundred three thousand, nine hundred eighty".