220671025 has 9 divisors (see below), whose sum is σ = 273724203.
Its totient is φ = 176477400.
The previous prime is 220670981. The next prime is 220671029. The reversal of 220671025 is 520176022.
Multipling 220671025 by its sum of digits (25), we get a square (5516775625 = 742752).
220671025 divided by its sum of digits (25) gives a square (8826841 = 29712).
The square root of 220671025 is 14855.
It is a perfect power (a square), and thus also a powerful number.
It can be written as a sum of positive squares in only one way, i.e., 79441569 + 141229456 = 8913^2 + 11884^2
It is not a de Polignac number, because 220671025 - 213 = 220662833 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (25).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (220671029) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 72790 + ... + 75760.
Almost surely, 2220671025 is an apocalyptic number.
220671025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.
220671025 is the 14855-th square number.
220671025 is the 7428-th centered octagonal number.
It is an amenable number.
220671025 is a deficient number, since it is larger than the sum of its proper divisors (53053178).
220671025 is an frugal number, since it uses more digits than its factorization.
220671025 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5952 (or 2976 counting only the distinct ones).
The product of its (nonzero) digits is 1680, while the sum is 25.
The cubic root of 220671025 is about 604.2942160087.
The spelling of 220671025 in words is "two hundred twenty million, six hundred seventy-one thousand, twenty-five".