123200020 has 24 divisors (see below), whose sum is σ = 273939624. Its totient is φ = 46381056.

The previous prime is 123200017. The next prime is 123200023. The reversal of 123200020 is 20002321.

It is an interprime number because it is at equal distance from previous prime (123200017) and next prime (123200023).

It can be written as a sum of positive squares in 4 ways, for example, as 18096516 + 105103504 = 4254^2 + 10252^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123200023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180837 + ... + 181516.

It is an arithmetic number, because the mean of its divisors is an integer number (11414151).

Almost surely, 2^123200020 is an apocalyptic number.

123200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123200020 is an abundant number, since it is smaller than the sum of its proper divisors (150739604).

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

123200020 is a wasteful number, since it uses less digits than its factorization.

123200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362379 (or 362377 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 123200020 is about 11099.5504413467. The cubic root of 123200020 is about 497.5884138716.

Adding to 123200020 its reverse (20002321), we get a palindrome (143202341).

The spelling of 123200020 in words is "one hundred twenty-three million, two hundred thousand, twenty".