1240020 has 54 divisors (see below), whose sum is σ = 3807258. Its totient is φ = 326688.

The previous prime is 1240013. The next prime is 1240021. The reversal of 1240020 is 200421.

It can be written as a sum of positive squares in only one way, i.e., 992016 + 248004 = 996^2 + 498^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 11.

It is a zygodrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 1239984 and 1240011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240021) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 14899 + ... + 14981.

2^1240020 is an apocalyptic number.

1240020 is a gapful number since it is divisible by the number (10) 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 1240020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1903629).

1240020 is an abundant number, since it is smaller than the sum of its proper divisors (2567238).

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

1240020 is a wasteful number, since it uses less digits than its factorization.

1240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 1240020 is about 1113.5618527949. The cubic root of 1240020 is about 107.4342846964.

Adding to 1240020 its reverse (200421), we get a palindrome (1440441).

The spelling of 1240020 in words is "one million, two hundred forty thousand, twenty".