2009235720 has 32 divisors (see below), whose sum is σ = 6027707520. Its totient is φ = 535796160.

The previous prime is 2009235719. The next prime is 2009235733. The reversal of 2009235720 is 275329002.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8371696 + ... + 8371935.

It is an arithmetic number, because the mean of its divisors is an integer number (188365860).

Almost surely, 2^2009235720 is an apocalyptic number.

2009235720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2009235720 is an abundant number, since it is smaller than the sum of its proper divisors (4018471800).

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

2009235720 is a wasteful number, since it uses less digits than its factorization.

2009235720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16743645 (or 16743641 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 2009235720 is about 44824.4991048422. The cubic root of 2009235720 is about 1261.8574519419.

The spelling of 2009235720 in words is "two billion, nine million, two hundred thirty-five thousand, seven hundred twenty".