220551764 has 6 divisors (see below), whose sum is σ = 385965594. Its totient is φ = 110275880.

The previous prime is 220551743. The next prime is 220551809. The reversal of 220551764 is 467155022.

It can be written as a sum of positive squares in only one way, i.e., 192376900 + 28174864 = 13870^2 + 5308^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 220551764.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27568967 + ... + 27568974.

It is an arithmetic number, because the mean of its divisors is an integer number (64327599).

Almost surely, 2^220551764 is an apocalyptic number.

It is an amenable number.

220551764 is a deficient number, since it is larger than the sum of its proper divisors (165413830).

220551764 is a wasteful number, since it uses less digits than its factorization.

220551764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55137945 (or 55137943 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 220551764 is about 14850.9852871788. The cubic root of 220551764 is about 604.1853333865.

The spelling of 220551764 in words is "two hundred twenty million, five hundred fifty-one thousand, seven hundred sixty-four".