223020945 has 80 divisors (see below), whose sum is σ = 462177408. Its totient is φ = 100776960.

The previous prime is 223020937. The next prime is 223020947. The reversal of 223020945 is 549020322.

It is not a de Polignac number, because 223020945 - 2³ = 223020937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (223020947) 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 79 ways as a sum of consecutive naturals, for example, 274590 + ... + 275400.

Almost surely, 2^223020945 is an apocalyptic number.

It is an amenable number.

223020945 is an abundant number, since it is smaller than the sum of its proper divisors (239156463).

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

223020945 is an equidigital number, since it uses as much as digits as its factorization.

223020945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932 (or 923 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 223020945 is about 14933.8857970724. The cubic root of 223020945 is about 606.4316843780.

The spelling of 223020945 in words is "two hundred twenty-three million, twenty thousand, nine hundred forty-five".