209495020 has 24 divisors (see below), whose sum is σ = 502788384. Its totient is φ = 71826816.

The previous prime is 209494981. The next prime is 209495021. The reversal of 209495020 is 20594902.

It is not an unprimeable number, because it can be changed into a prime (209495021) 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, 748057 + ... + 748336.

It is an arithmetic number, because the mean of its divisors is an integer number (20949516).

Almost surely, 2^209495020 is an apocalyptic number.

209495020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209495020 is an abundant number, since it is smaller than the sum of its proper divisors (293293364).

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

209495020 is a wasteful number, since it uses less digits than its factorization.

209495020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496409 (or 1496407 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 209495020 is about 14473.9427938624. The cubic root of 209495020 is about 593.9153745072.

The spelling of 209495020 in words is "two hundred nine million, four hundred ninety-five thousand, twenty".