126543220 has 24 divisors (see below), whose sum is σ = 272224008. Its totient is φ = 49382400.

The previous prime is 126543191. The next prime is 126543233. The reversal of 126543220 is 22345621.

It can be written as a sum of positive squares in 4 ways, for example, as 6290064 + 120253156 = 2508^2 + 10966^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76341 + ... + 77980.

It is an arithmetic number, because the mean of its divisors is an integer number (11342667).

Almost surely, 2^126543220 is an apocalyptic number.

126543220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

126543220 is an abundant number, since it is smaller than the sum of its proper divisors (145680788).

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

126543220 is a wasteful number, since it uses less digits than its factorization.

126543220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154371 (or 154369 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 126543220 is about 11249.1430784749. The cubic root of 126543220 is about 502.0492166155.

Adding to 126543220 its reverse (22345621), we get a palindrome (148888841).

The spelling of 126543220 in words is "one hundred twenty-six million, five hundred forty-three thousand, two hundred twenty".