220720187 has 4 divisors (see below), whose sum is σ = 220780056. Its totient is φ = 220660320.

The previous prime is 220720153. The next prime is 220720211. The reversal of 220720187 is 781027022.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 220720187 - 2¹² = 220716091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220720117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24014 + ... + 31907.

It is an arithmetic number, because the mean of its divisors is an integer number (55195014).

Almost surely, 2^220720187 is an apocalyptic number.

220720187 is a deficient number, since it is larger than the sum of its proper divisors (59869).

220720187 is an equidigital number, since it uses as much as digits as its factorization.

220720187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59868.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 220720187 is about 14856.6546368959. The cubic root of 220720187 is about 604.3390883948.

The spelling of 220720187 in words is "two hundred twenty million, seven hundred twenty thousand, one hundred eighty-seven".