220155797 has 4 divisors (see below), whose sum is σ = 233106156. Its totient is φ = 207205440.

The previous prime is 220155781. The next prime is 220155823. The reversal of 220155797 is 797551022.

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 167288356 + 52867441 = 12934^2 + 7271^2 .

It is a cyclic number.

It is not a de Polignac number, because 220155797 - 2⁴ = 220155781 is a prime.

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 220155797.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220155737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6475154 + ... + 6475187.

It is an arithmetic number, because the mean of its divisors is an integer number (58276539).

Almost surely, 2^220155797 is an apocalyptic number.

It is an amenable number.

220155797 is a deficient number, since it is larger than the sum of its proper divisors (12950359).

220155797 is a wasteful number, since it uses less digits than its factorization.

220155797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12950358.

The product of its (nonzero) digits is 44100, while the sum is 38.

The square root of 220155797 is about 14837.6479605091. The cubic root of 220155797 is about 603.8235426305.

The spelling of 220155797 in words is "two hundred twenty million, one hundred fifty-five thousand, seven hundred ninety-seven".