20452520 has 128 divisors (see below), whose sum is σ = 54743040. Its totient is φ = 6800640.

The previous prime is 20452519. The next prime is 20452559. The reversal of 20452520 is 2525402.

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 = 20452492 and 20452501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 435137 + ... + 435183.

It is an arithmetic number, because the mean of its divisors is an integer number (427680).

Almost surely, 2^20452520 is an apocalyptic number.

20452520 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 20452520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27371520).

20452520 is an abundant number, since it is smaller than the sum of its proper divisors (34290520).

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

20452520 is a wasteful number, since it uses less digits than its factorization.

20452520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20452520 is about 4522.4462406976. The cubic root of 20452520 is about 273.4737265418.

Adding to 20452520 its reverse (2525402), we get a palindrome (22977922).

The spelling of 20452520 in words is "twenty million, four hundred fifty-two thousand, five hundred twenty".