12506220 has 144 divisors (see below), whose sum is σ = 41434848. Its totient is φ = 3041280.

The previous prime is 12506167. The next prime is 12506233. The reversal of 12506220 is 2260521.

12506220 = T₁₂₀ + T₁₂₁ + ... + T₄₂₄.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12506193 and 12506202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 186627 + ... + 186693.

It is an arithmetic number, because the mean of its divisors is an integer number (287742).

Almost surely, 2^12506220 is an apocalyptic number.

12506220 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 12506220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20717424).

12506220 is an abundant number, since it is smaller than the sum of its proper divisors (28928628).

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

12506220 is a wasteful number, since it uses less digits than its factorization.

12506220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 155 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12506220 is about 3536.4134373684. The cubic root of 12506220 is about 232.1179295409.

Adding to 12506220 its reverse (2260521), we get a palindrome (14766741).

The spelling of 12506220 in words is "twelve million, five hundred six thousand, two hundred twenty".