220538491 has 4 divisors (see below), whose sum is σ = 232145800. Its totient is φ = 208931184.

The previous prime is 220538477. The next prime is 220538509. The reversal of 220538491 is 194835022.

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 220538491 - 2²¹ = 218441339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220538431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5803626 + ... + 5803663.

It is an arithmetic number, because the mean of its divisors is an integer number (58036450).

Almost surely, 2^220538491 is an apocalyptic number.

220538491 is a deficient number, since it is larger than the sum of its proper divisors (11607309).

220538491 is a wasteful number, since it uses less digits than its factorization.

220538491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11607308.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 220538491 is about 14850.5384077481. The cubic root of 220538491 is about 604.1732130077.

The spelling of 220538491 in words is "two hundred twenty million, five hundred thirty-eight thousand, four hundred ninety-one".