123020644 has 6 divisors (see below), whose sum is σ = 215286134. Its totient is φ = 61510320.

The previous prime is 123020641. The next prime is 123020669. The reversal of 123020644 is 446020321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 68260644 + 54760000 = 8262^2 + 7400^2 .

It is not an unprimeable number, because it can be changed into a prime (123020641) by changing a digit.

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, 15377577 + ... + 15377584.

Almost surely, 2^123020644 is an apocalyptic number.

It is an amenable number.

123020644 is a deficient number, since it is larger than the sum of its proper divisors (92265490).

123020644 is a wasteful number, since it uses less digits than its factorization.

123020644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30755165 (or 30755163 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 123020644 is about 11091.4671707579. The cubic root of 123020644 is about 497.3468046785.

Adding to 123020644 its reverse (446020321), we get a palindrome (569040965).

The spelling of 123020644 in words is "one hundred twenty-three million, twenty thousand, six hundred forty-four".