123020424 has 64 divisors (see below), whose sum is σ = 345168000. Its totient is φ = 40593600.

The previous prime is 123020423. The next prime is 123020441. The reversal of 123020424 is 424020321.

It is a super-2 number, since 2×123020424² = 30268049442279552, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 123020397 and 123020406.

It is not an unprimeable number, because it can be changed into a prime (123020423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18997 + ... + 24635.

It is an arithmetic number, because the mean of its divisors is an integer number (5393250).

Almost surely, 2^123020424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123020424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172584000).

123020424 is an abundant number, since it is smaller than the sum of its proper divisors (222147576).

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

123020424 is a wasteful number, since it uses less digits than its factorization.

123020424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5755 (or 5745 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 123020424 is about 11091.4572532197. The cubic root of 123020424 is about 497.3465082070.

Adding to 123020424 its reverse (424020321), we get a palindrome (547040745).

The spelling of 123020424 in words is "one hundred twenty-three million, twenty thousand, four hundred twenty-four".