220581923 has 2 divisors, whose sum is σ = 220581924. Its totient is φ = 220581922.

The previous prime is 220581863. The next prime is 220581929. The reversal of 220581923 is 329185022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220581923 - 2²⁴ = 203804707 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220581923.

It is not a weakly prime, because it can be changed into another prime (220581929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110290961 + 110290962.

It is an arithmetic number, because the mean of its divisors is an integer number (110290962).

Almost surely, 2^220581923 is an apocalyptic number.

220581923 is a deficient number, since it is larger than the sum of its proper divisors (1).

220581923 is an equidigital number, since it uses as much as digits as its factorization.

220581923 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 220581923 is about 14852.0006396445. Note that the first 3 decimals coincide. The cubic root of 220581923 is about 604.2128715853.

The spelling of 220581923 in words is "two hundred twenty million, five hundred eighty-one thousand, nine hundred twenty-three".