20450520 has 48 divisors (see below), whose sum is σ = 66465360. Its totient is φ = 5453376.

The previous prime is 20450491. The next prime is 20450531. The reversal of 20450520 is 2505402.

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 = 20450493 and 20450502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28044 + ... + 28763.

It is an arithmetic number, because the mean of its divisors is an integer number (1384695).

Almost surely, 2^20450520 is an apocalyptic number.

20450520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20450520 is an abundant number, since it is smaller than the sum of its proper divisors (46014840).

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

20450520 is a wasteful number, since it uses less digits than its factorization.

20450520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56824 (or 56817 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 20450520 is about 4522.2251160242. The cubic root of 20450520 is about 273.4648121508.

Adding to 20450520 its reverse (2505402), we get a palindrome (22955922).

The spelling of 20450520 in words is "twenty million, four hundred fifty thousand, five hundred twenty".