20100220 has 24 divisors (see below), whose sum is σ = 48240864. Its totient is φ = 6891456.

The previous prime is 20100217. The next prime is 20100251. The reversal of 20100220 is 2200102.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71647 + ... + 71926.

It is an arithmetic number, because the mean of its divisors is an integer number (2010036).

Almost surely, 2^20100220 is an apocalyptic number.

20100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20100220 is an abundant number, since it is smaller than the sum of its proper divisors (28140644).

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

20100220 is a wasteful number, since it uses less digits than its factorization.

20100220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143589 (or 143587 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 20100220 is about 4483.3268897104. The cubic root of 20100220 is about 271.8944046572.

Adding to 20100220 its reverse (2200102), we get a palindrome (22300322).

The spelling of 20100220 in words is "twenty million, one hundred thousand, two hundred twenty".