220400261 has 16 divisors (see below), whose sum is σ = 231504000. Its totient is φ = 209563200.

The previous prime is 220400239. The next prime is 220400263. The reversal of 220400261 is 162004022.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-220400261 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 (220400263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1044446 + ... + 1044656.

It is an arithmetic number, because the mean of its divisors is an integer number (14469000).

Almost surely, 2^220400261 is an apocalyptic number.

It is an amenable number.

220400261 is a deficient number, since it is larger than the sum of its proper divisors (11103739).

220400261 is a wasteful number, since it uses less digits than its factorization.

220400261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 220400261 is about 14845.8836382345. The cubic root of 220400261 is about 604.0469579225.

Adding to 220400261 its reverse (162004022), we get a palindrome (382404283).

The spelling of 220400261 in words is "two hundred twenty million, four hundred thousand, two hundred sixty-one".