20461320 has 96 divisors (see below), whose sum is σ = 72558720. Its totient is φ = 4959360.

The previous prime is 20461307. The next prime is 20461321. The reversal of 20461320 is 2316402.

It is a happy number.

It is a super-2 number, since 2×20461320² = 837331232284800, which contains 22 as substring.

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 = 20461293 and 20461302.

It is not an unprimeable number, because it can be changed into a prime (20461321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1377 + ... + 6543.

It is an arithmetic number, because the mean of its divisors is an integer number (755820).

Almost surely, 2^20461320 is an apocalyptic number.

20461320 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 20461320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36279360).

20461320 is an abundant number, since it is smaller than the sum of its proper divisors (52097400).

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

20461320 is a wasteful number, since it uses less digits than its factorization.

20461320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5195 (or 5188 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 20461320 is about 4523.4190608432. The cubic root of 20461320 is about 273.5129429598.

Adding to 20461320 its reverse (2316402), we get a palindrome (22777722).

The spelling of 20461320 in words is "twenty million, four hundred sixty-one thousand, three hundred twenty".