123031020 has 96 divisors (see below), whose sum is σ = 401200128. Its totient is φ = 27585792.

The previous prime is 123030959. The next prime is 123031081. The reversal of 123031020 is 20130321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123030959) and next prime (123031081).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 123030987 and 123031005.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19497 + ... + 25023.

It is an arithmetic number, because the mean of its divisors is an integer number (4179168).

Almost surely, 2^123031020 is an apocalyptic number.

123031020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123031020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200600064).

123031020 is an abundant number, since it is smaller than the sum of its proper divisors (278169108).

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

123031020 is a wasteful number, since it uses less digits than its factorization.

123031020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5599 (or 5597 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 123031020 is about 11091.9349078508. The cubic root of 123031020 is about 497.3607869534.

Adding to 123031020 its reverse (20130321), we get a palindrome (143161341).

The spelling of 123031020 in words is "one hundred twenty-three million, thirty-one thousand, twenty".