20143220 has 12 divisors (see below), whose sum is σ = 42300804. Its totient is φ = 8057280.

The previous prime is 20143219. The next prime is 20143223. The reversal of 20143220 is 2234102.

It can be written as a sum of positive squares in 2 ways, for example, as 4477456 + 15665764 = 2116^2 + 3958^2 .

It is a junction number, because it is equal to n+sod(n) for n = 20143195 and 20143204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20143223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 503561 + ... + 503600.

It is an arithmetic number, because the mean of its divisors is an integer number (3525067).

Almost surely, 2^20143220 is an apocalyptic number.

20143220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20143220 is an abundant number, since it is smaller than the sum of its proper divisors (22157584).

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

20143220 is a wasteful number, since it uses less digits than its factorization.

20143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1007170 (or 1007168 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 20143220 is about 4488.1198736219. The cubic root of 20143220 is about 272.0881526558.

Adding to 20143220 its reverse (2234102), we get a palindrome (22377322).

The spelling of 20143220 in words is "twenty million, one hundred forty-three thousand, two hundred twenty".