1520220 has 48 divisors (see below), whose sum is σ = 4586400. Its totient is φ = 374016.

The previous prime is 1520213. The next prime is 1520221. The reversal of 1520220 is 220251.

It is a super-2 number, since 2×1520220² = 4622137696800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1520196 and 1520205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520221) 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 15 ways as a sum of consecutive naturals, for example, 195 + ... + 1754.

It is an arithmetic number, because the mean of its divisors is an integer number (95550).

2^1520220 is an apocalyptic number.

1520220 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 1520220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2293200).

1520220 is an abundant number, since it is smaller than the sum of its proper divisors (3066180).

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

1520220 is a wasteful number, since it uses less digits than its factorization.

1520220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974 (or 1972 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 1520220 is about 1232.9720191472. The cubic root of 1520220 is about 114.9834884927.

Adding to 1520220 its reverse (220251), we get a palindrome (1740471).

The spelling of 1520220 in words is "one million, five hundred twenty thousand, two hundred twenty".