1220020 has 12 divisors (see below), whose sum is σ = 2562084. Its totient is φ = 488000.

The previous prime is 1219991. The next prime is 1220027. The reversal of 1220020 is 200221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 620944 + 599076 = 788^2 + 774^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1219985 and 1220012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30481 + ... + 30520.

It is an arithmetic number, because the mean of its divisors is an integer number (213507).

2^1220020 is an apocalyptic number.

1220020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220020 is an abundant number, since it is smaller than the sum of its proper divisors (1342064).

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

1220020 is a wasteful number, since it uses less digits than its factorization.

1220020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61010 (or 61008 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 1220020 is about 1104.5451552562. The cubic root of 1220020 is about 106.8535569077.

Adding to 1220020 its reverse (200221), we get a palindrome (1420241).

The spelling of 1220020 in words is "one million, two hundred twenty thousand, twenty".