8145220 has 24 divisors (see below), whose sum is σ = 17849664. Its totient is φ = 3116256.

The previous prime is 8145211. The next prime is 8145223. The reversal of 8145220 is 225418.

It is a junction number, because it is equal to n+sod(n) for n = 8145191 and 8145200.

It is not an unprimeable number, because it can be changed into a prime (8145223) 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, 8394 + ... + 9313.

It is an arithmetic number, because the mean of its divisors is an integer number (743736).

Almost surely, 2^8145220 is an apocalyptic number.

It is an amenable number.

8145220 is an abundant number, since it is smaller than the sum of its proper divisors (9704444).

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

8145220 is a wasteful number, since it uses less digits than its factorization.

8145220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17739 (or 17737 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 8145220 is about 2853.9831814501. The cubic root of 8145220 is about 201.2029171135.

The spelling of 8145220 in words is "eight million, one hundred forty-five thousand, two hundred twenty".