231720560 has 20 divisors (see below), whose sum is σ = 538750488. Its totient is φ = 92688192.

The previous prime is 231720551. The next prime is 231720581. The reversal of 231720560 is 65027132.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1448174 + ... + 1448333.

Almost surely, 2^231720560 is an apocalyptic number.

231720560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231720560 is an abundant number, since it is smaller than the sum of its proper divisors (307029928).

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

231720560 is a wasteful number, since it uses less digits than its factorization.

231720560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2896520 (or 2896514 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 231720560 is about 15222.3703804631. The cubic root of 231720560 is about 614.2165625111.

Adding to 231720560 its reverse (65027132), we get a palindrome (296747692).

The spelling of 231720560 in words is "two hundred thirty-one million, seven hundred twenty thousand, five hundred sixty".