220120409 has 2 divisors, whose sum is σ = 220120410. Its totient is φ = 220120408.

The previous prime is 220120387. The next prime is 220120427. The reversal of 220120409 is 904021022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208369225 + 11751184 = 14435^2 + 3428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220120409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (220120499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110060204 + 110060205.

It is an arithmetic number, because the mean of its divisors is an integer number (110060205).

Almost surely, 2^220120409 is an apocalyptic number.

It is an amenable number.

220120409 is a deficient number, since it is larger than the sum of its proper divisors (1).

220120409 is an equidigital number, since it uses as much as digits as its factorization.

220120409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 220120409 is about 14836.4554055206. The cubic root of 220120409 is about 603.7911878878.

The spelling of 220120409 in words is "two hundred twenty million, one hundred twenty thousand, four hundred nine".