20562220 has 48 divisors (see below), whose sum is σ = 49670208. Its totient is φ = 7004160.

The previous prime is 20562203. The next prime is 20562221. The reversal of 20562220 is 2226502.

It is not an unprimeable number, because it can be changed into a prime (20562221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26640 + ... + 27400.

It is an arithmetic number, because the mean of its divisors is an integer number (1034796).

Almost surely, 2^20562220 is an apocalyptic number.

20562220 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 20562220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24835104).

20562220 is an abundant number, since it is smaller than the sum of its proper divisors (29107988).

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

20562220 is a wasteful number, since it uses less digits than its factorization.

20562220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 968 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 20562220 is about 4534.5584128998. The cubic root of 20562220 is about 273.9617933833.

Adding to 20562220 its reverse (2226502), we get a palindrome (22788722).

The spelling of 20562220 in words is "twenty million, five hundred sixty-two thousand, two hundred twenty".