123206420 has 12 divisors (see below), whose sum is σ = 258733524. Its totient is φ = 49282560.

The previous prime is 123206401. The next prime is 123206441. The reversal of 123206420 is 24602321.

It can be written as a sum of positive squares in 2 ways, for example, as 78074896 + 45131524 = 8836^2 + 6718^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 6160321 = 123206420 / (1 + 2 + 3 + 2 + 0 + 6 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 123206392 and 123206401.

It is a congruent number.

It is an unprimeable number.

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, 3080141 + ... + 3080180.

It is an arithmetic number, because the mean of its divisors is an integer number (21561127).

Almost surely, 2^123206420 is an apocalyptic number.

123206420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123206420 is an abundant number, since it is smaller than the sum of its proper divisors (135527104).

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

123206420 is a wasteful number, since it uses less digits than its factorization.

123206420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6160330 (or 6160328 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 123206420 is about 11099.8387375673. The cubic root of 123206420 is about 497.5970299706.

Adding to 123206420 its reverse (24602321), we get a palindrome (147808741).

The spelling of 123206420 in words is "one hundred twenty-three million, two hundred six thousand, four hundred twenty".