209347397220 has 96 divisors (see below), whose sum is σ = 634534169472. Its totient is φ = 51264626688.

The previous prime is 209347397219. The next prime is 209347397249. The reversal of 209347397220 is 22793743902.

209347397220 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 209347397220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 544782 + ... + 845861.

It is an arithmetic number, because the mean of its divisors is an integer number (6609730932).

Almost surely, 2^209347397220 is an apocalyptic number.

209347397220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209347397220 is an abundant number, since it is smaller than the sum of its proper divisors (425186772252).

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

209347397220 is a wasteful number, since it uses less digits than its factorization.

209347397220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390861 (or 1390859 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 48.

The spelling of 209347397220 in words is "two hundred nine billion, three hundred forty-seven million, three hundred ninety-seven thousand, two hundred twenty".