123020205 has 64 divisors (see below), whose sum is σ = 251209728. Its totient is φ = 49916160.

The previous prime is 123020203. The next prime is 123020207. The reversal of 123020205 is 502020321.

It is an interprime number because it is at equal distance from previous prime (123020203) and next prime (123020207).

It is not a de Polignac number, because 123020205 - 2¹ = 123020203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123020203) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48427 + ... + 50903.

It is an arithmetic number, because the mean of its divisors is an integer number (3925152).

Almost surely, 2^123020205 is an apocalyptic number.

123020205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123020205 is an abundant number, since it is smaller than the sum of its proper divisors (128189523).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123020205 is a wasteful number, since it uses less digits than its factorization.

123020205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 123020205 is about 11091.4473807524. The cubic root of 123020205 is about 497.3462130827.

Adding to 123020205 its reverse (502020321), we get a palindrome (625040526).

The spelling of 123020205 in words is "one hundred twenty-three million, twenty thousand, two hundred five".