20340320 has 192 divisors, whose sum is σ = 65028096. Its totient is φ = 5806080.

The previous prime is 20340319. The next prime is 20340323. The reversal of 20340320 is 2304302.

20340320 = T₂₂₅ + T₂₂₆ + ... + T₅₁₀.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 20340295 and 20340304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20340323) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160097 + ... + 160223.

It is an arithmetic number, because the mean of its divisors is an integer number (338688).

Almost surely, 2^20340320 is an apocalyptic number.

20340320 is a gapful number since it is divisible by the number (20) 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 20340320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32514048).

20340320 is an abundant number, since it is smaller than the sum of its proper divisors (44687776).

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

20340320 is a wasteful number, since it uses less digits than its factorization.

20340320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 14.

The square root of 20340320 is about 4510.0243901780. The cubic root of 20340320 is about 272.9727282485.

Adding to 20340320 its reverse (2304302), we get a palindrome (22644622).

The spelling of 20340320 in words is "twenty million, three hundred forty thousand, three hundred twenty".