345321020 has 48 divisors (see below), whose sum is σ = 798983136. Its totient is φ = 124320000.

The previous prime is 345321013. The next prime is 345321049. The reversal of 345321020 is 20123543.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 345320983 and 345321001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14450 + ... + 29990.

It is an arithmetic number, because the mean of its divisors is an integer number (16645482).

Almost surely, 2^345321020 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 345321020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (399491568).

345321020 is an abundant number, since it is smaller than the sum of its proper divisors (453662116).

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

345321020 is a wasteful number, since it uses less digits than its factorization.

345321020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15662 (or 15660 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 345321020 is about 18582.8151796223. The cubic root of 345321020 is about 701.5753770634.

Adding to 345321020 its reverse (20123543), we get a palindrome (365444563).

The spelling of 345321020 in words is "three hundred forty-five million, three hundred twenty-one thousand, twenty".