220387491 has 6 divisors (see below), whose sum is σ = 318337500. Its totient is φ = 146924988.

The previous prime is 220387487. The next prime is 220387529. The reversal of 220387491 is 194783022.

It is not a de Polignac number, because 220387491 - 2² = 220387487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220387471) 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 5 ways as a sum of consecutive naturals, for example, 12243741 + ... + 12243758.

It is an arithmetic number, because the mean of its divisors is an integer number (53056250).

Almost surely, 2^220387491 is an apocalyptic number.

220387491 is a deficient number, since it is larger than the sum of its proper divisors (97950009).

220387491 is a wasteful number, since it uses less digits than its factorization.

220387491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24487505 (or 24487502 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 220387491 is about 14845.4535464566. The cubic root of 220387491 is about 604.0352915288.

The spelling of 220387491 in words is "two hundred twenty million, three hundred eighty-seven thousand, four hundred ninety-one".