20520320 has 32 divisors (see below), whose sum is σ = 49057920. Its totient is φ = 8207872.

The previous prime is 20520319. The next prime is 20520337. The reversal of 20520320 is 2302502.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-3 number, since 3×20520320³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20520295 and 20520304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15392 + ... + 16671.

It is an arithmetic number, because the mean of its divisors is an integer number (1533060).

Almost surely, 2^20520320 is an apocalyptic number.

20520320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20520320 is an abundant number, since it is smaller than the sum of its proper divisors (28537600).

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

20520320 is an equidigital number, since it uses as much as digits as its factorization.

20520320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32082 (or 32070 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 14.

The square root of 20520320 is about 4529.9359818876. The cubic root of 20520320 is about 273.7755812433.

Adding to 20520320 its reverse (2302502), we get a palindrome (22822822).

The spelling of 20520320 in words is "twenty million, five hundred twenty thousand, three hundred twenty".