220301991 has 48 divisors (see below), whose sum is σ = 408895200. Its totient is φ = 116194176.

The previous prime is 220301989. The next prime is 220301993. The reversal of 220301991 is 199103022.

It is an interprime number because it is at equal distance from previous prime (220301989) and next prime (220301993).

It is not a de Polignac number, because 220301991 - 2¹ = 220301989 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220301993) 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 47 ways as a sum of consecutive naturals, for example, 10795 + ... + 23603.

It is an arithmetic number, because the mean of its divisors is an integer number (8518650).

Almost surely, 2^220301991 is an apocalyptic number.

220301991 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

220301991 is a deficient number, since it is larger than the sum of its proper divisors (188593209).

220301991 is a wasteful number, since it uses less digits than its factorization.

220301991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12845 (or 12832 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 220301991 is about 14842.5735975942. The cubic root of 220301991 is about 603.9571689801.

The spelling of 220301991 in words is "two hundred twenty million, three hundred one thousand, nine hundred ninety-one".