247720 has 32 divisors (see below), whose sum is σ = 609120. Its totient is φ = 89920.

The previous prime is 247717. The next prime is 247729. The reversal of 247720 is 27742.

It is a super-2 number, since 2×247720² = 122730396800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 247691 and 247700.

It is not an unprimeable number, because it can be changed into a prime (247729) 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, 159 + ... + 721.

It is an arithmetic number, because the mean of its divisors is an integer number (19035).

2²⁴⁷⁷²⁰ is an apocalyptic number.

247720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 247720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (304560).

247720 is an abundant number, since it is smaller than the sum of its proper divisors (361400).

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

247720 is a wasteful number, since it uses less digits than its factorization.

247720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 22.

The square root of 247720 is about 497.7147777593. The cubic root of 247720 is about 62.8039593431.

Adding to 247720 its sum of digits (22), we get a palindrome (247742).

It can be divided in two parts, 24 and 7720, that added together give a square (7744 = 88²).

The spelling of 247720 in words is "two hundred forty-seven thousand, seven hundred twenty", and thus it is an iban number.