243520920 has 96 divisors (see below), whose sum is σ = 838019520. Its totient is φ = 61117440.

The previous prime is 243520913. The next prime is 243520951. The reversal of 243520920 is 29025342.

243520920 is a `hidden beast` number, since 2 + 435 + 209 + 20 = 666.

243520920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13776 + ... + 26015.

It is an arithmetic number, because the mean of its divisors is an integer number (8729370).

Almost surely, 2^243520920 is an apocalyptic number.

243520920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243520920 is an abundant number, since it is smaller than the sum of its proper divisors (594498600).

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

243520920 is a wasteful number, since it uses less digits than its factorization.

243520920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39825 (or 39818 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 243520920 is about 15605.1568399680. The cubic root of 243520920 is about 624.4707370023.

The spelling of 243520920 in words is "two hundred forty-three million, five hundred twenty thousand, nine hundred twenty".