20150220 has 48 divisors (see below), whose sum is σ = 56786688. Its totient is φ = 5338560.

The previous prime is 20150197. The next prime is 20150227. The reversal of 20150220 is 2205102.

20150220 = 261² + 262² + ... + 427².

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 20150196 and 20150205.

It is not an unprimeable number, because it can be changed into a prime (20150227) 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, 9015 + ... + 11025.

It is an arithmetic number, because the mean of its divisors is an integer number (1183056).

Almost surely, 2^20150220 is an apocalyptic number.

20150220 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 20150220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28393344).

20150220 is an abundant number, since it is smaller than the sum of its proper divisors (36636468).

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

20150220 is a wasteful number, since it uses less digits than its factorization.

20150220 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 12.

The square root of 20150220 is about 4488.8996424514. The cubic root of 20150220 is about 272.1196669236.

Adding to 20150220 its reverse (2205102), we get a palindrome (22355322).

The spelling of 20150220 in words is "twenty million, one hundred fifty thousand, two hundred twenty".