20532220 has 24 divisors (see below), whose sum is σ = 43269408. Its totient is φ = 8184000.

The previous prime is 20532191. The next prime is 20532227. The reversal of 20532220 is 2223502.

It is a junction number, because it is equal to n+sod(n) for n = 20532194 and 20532203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20532227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4570 + ... + 7870.

It is an arithmetic number, because the mean of its divisors is an integer number (1802892).

Almost surely, 2^20532220 is an apocalyptic number.

20532220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20532220 is an abundant number, since it is smaller than the sum of its proper divisors (22737188).

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

20532220 is a wasteful number, since it uses less digits than its factorization.

20532220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621 (or 3619 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 20532220 is about 4531.2492758620. The cubic root of 20532220 is about 273.8284930213.

Adding to 20532220 its reverse (2223502), we get a palindrome (22755722).

The spelling of 20532220 in words is "twenty million, five hundred thirty-two thousand, two hundred twenty".