220309491 has 16 divisors (see below), whose sum is σ = 308864160. Its totient is φ = 139480320.

The previous prime is 220309489. The next prime is 220309493. The reversal of 220309491 is 194903022.

It is an interprime number because it is at equal distance from previous prime (220309489) and next prime (220309493).

It is not a de Polignac number, because 220309491 - 2¹ = 220309489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220309493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15450 + ... + 26063.

It is an arithmetic number, because the mean of its divisors is an integer number (19304010).

Almost surely, 2^220309491 is an apocalyptic number.

220309491 is a deficient number, since it is larger than the sum of its proper divisors (88554669).

220309491 is a wasteful number, since it uses less digits than its factorization.

220309491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41606.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 220309491 is about 14842.8262470461. The cubic root of 220309491 is about 603.9640226440.

The spelling of 220309491 in words is "two hundred twenty million, three hundred nine thousand, four hundred ninety-one".