20500220 has 48 divisors (see below), whose sum is σ = 47637408. Its totient is φ = 7361280.

The previous prime is 20500219. The next prime is 20500223. The reversal of 20500220 is 2200502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20500223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8555 + ... + 10685.

It is an arithmetic number, because the mean of its divisors is an integer number (992446).

Almost surely, 2^20500220 is an apocalyptic number.

20500220 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 20500220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23818704).

20500220 is an abundant number, since it is smaller than the sum of its proper divisors (27137188).

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

20500220 is a wasteful number, since it uses less digits than its factorization.

20500220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 2188 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 20500220 is about 4527.7168639393. The cubic root of 20500220 is about 273.6861627728.

Adding to 20500220 its reverse (2200502), we get a palindrome (22700722).

The spelling of 20500220 in words is "twenty million, five hundred thousand, two hundred twenty".