220243957 has 4 divisors (see below), whose sum is σ = 220374540. Its totient is φ = 220113376.

The previous prime is 220243937. The next prime is 220243967. The reversal of 220243957 is 759342022.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 102434641 + 117809316 = 10121^2 + 10854^2 .

It is a cyclic number.

It is not a de Polignac number, because 220243957 - 2²³ = 211855349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220243937) 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, 62728 + ... + 66145.

It is an arithmetic number, because the mean of its divisors is an integer number (55093635).

Almost surely, 2^220243957 is an apocalyptic number.

It is an amenable number.

220243957 is a deficient number, since it is larger than the sum of its proper divisors (130583).

220243957 is a wasteful number, since it uses less digits than its factorization.

220243957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130582.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 220243957 is about 14840.6184844163. The cubic root of 220243957 is about 603.9041309839.

Adding to 220243957 its reverse (759342022), we get a palindrome (979585979).

The spelling of 220243957 in words is "two hundred twenty million, two hundred forty-three thousand, nine hundred fifty-seven".