220617431 has 4 divisors (see below), whose sum is σ = 222801864. Its totient is φ = 218433000.

The previous prime is 220617427. The next prime is 220617437. The reversal of 220617431 is 134716022.

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 220617431 - 2² = 220617427 is a prime.

It is a super-2 number, since 2×220617431² = 97344101722079522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 220617431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220617437) 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, 1092065 + ... + 1092266.

It is an arithmetic number, because the mean of its divisors is an integer number (55700466).

Almost surely, 2^220617431 is an apocalyptic number.

220617431 is a deficient number, since it is larger than the sum of its proper divisors (2184433).

220617431 is a wasteful number, since it uses less digits than its factorization.

220617431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184432.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 220617431 is about 14853.1959860496. The cubic root of 220617431 is about 604.2452907417.

It can be divided in two parts, 22061 and 7431, that added together give a palindrome (29492).

The spelling of 220617431 in words is "two hundred twenty million, six hundred seventeen thousand, four hundred thirty-one".