209420880 has 40 divisors (see below), whose sum is σ = 649205472. Its totient is φ = 55845504.

The previous prime is 209420837. The next prime is 209420881. The reversal of 209420880 is 88024902.

209420880 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209420881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 436054 + ... + 436533.

Almost surely, 2^209420880 is an apocalyptic number.

209420880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209420880 is an abundant number, since it is smaller than the sum of its proper divisors (439784592).

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

209420880 is a wasteful number, since it uses less digits than its factorization.

209420880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872603 (or 872597 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 33.

The square root of 209420880 is about 14471.3814129820. The cubic root of 209420880 is about 593.8453042954.

The spelling of 209420880 in words is "two hundred nine million, four hundred twenty thousand, eight hundred eighty".