20470320 has 200 divisors, whose sum is σ = 76880496. Its totient is φ = 5038848.

The previous prime is 20470297. The next prime is 20470321. The reversal of 20470320 is 2307402.

It is a happy number.

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 = 20470293 and 20470302.

It is not an unprimeable number, because it can be changed into a prime (20470321) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1574634 + ... + 1574646.

Almost surely, 2^20470320 is an apocalyptic number.

20470320 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 20470320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38440248).

20470320 is an abundant number, since it is smaller than the sum of its proper divisors (56410176).

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

20470320 is an frugal number, since it uses more digits than its factorization.

20470320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 18.

The square root of 20470320 is about 4524.4137741811. The cubic root of 20470320 is about 273.5530390314.

Adding to 20470320 its reverse (2307402), we get a palindrome (22777722).

The spelling of 20470320 in words is "twenty million, four hundred seventy thousand, three hundred twenty".