145023220 has 24 divisors (see below), whose sum is σ = 305310600. Its totient is φ = 57864192.

The previous prime is 145023167. The next prime is 145023227. The reversal of 145023220 is 22320541.

It can be written as a sum of positive squares in 4 ways, for example, as 53553124 + 91470096 = 7318^2 + 9564^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145023227) 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, 685 + ... + 17044.

It is an arithmetic number, because the mean of its divisors is an integer number (12721275).

Almost surely, 2^145023220 is an apocalyptic number.

145023220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145023220 is an abundant number, since it is smaller than the sum of its proper divisors (160287380).

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

145023220 is a wasteful number, since it uses less digits than its factorization.

145023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18147 (or 18145 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 145023220 is about 12042.5586982169. The cubic root of 145023220 is about 525.3868290422.

Adding to 145023220 its reverse (22320541), we get a palindrome (167343761).

The spelling of 145023220 in words is "one hundred forty-five million, twenty-three thousand, two hundred twenty".