220205691 has 12 divisors (see below), whose sum is σ = 318284200. Its totient is φ = 146707200.

The previous prime is 220205683. The next prime is 220205747. The reversal of 220205691 is 196502022.

It is not a de Polignac number, because 220205691 - 2³ = 220205683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220205291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8091 + ... + 22491.

Almost surely, 2^220205691 is an apocalyptic number.

220205691 is a deficient number, since it is larger than the sum of its proper divisors (98078509).

220205691 is a wasteful number, since it uses less digits than its factorization.

220205691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16106 (or 16103 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 220205691 is about 14839.3291964293. The cubic root of 220205691 is about 603.8691541121.

The spelling of 220205691 in words is "two hundred twenty million, two hundred five thousand, six hundred ninety-one".