20543225 has 12 divisors (see below), whose sum is σ = 26972604. Its totient is φ = 15467520.

The previous prime is 20543221. The next prime is 20543233. The reversal of 20543225 is 52234502.

It can be written as a sum of positive squares in 6 ways, for example, as 900601 + 19642624 = 949^2 + 4432^2 .

It is not a de Polignac number, because 20543225 - 2² = 20543221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20543225.

It is not an unprimeable number, because it can be changed into a prime (20543221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23744 + ... + 24593.

It is an arithmetic number, because the mean of its divisors is an integer number (2247717).

Almost surely, 2^20543225 is an apocalyptic number.

20543225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

20543225 is a deficient number, since it is larger than the sum of its proper divisors (6429379).

20543225 is a wasteful number, since it uses less digits than its factorization.

20543225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48364 (or 48359 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 20543225 is about 4532.4634582090. The cubic root of 20543225 is about 273.8774071074.

Adding to 20543225 its reverse (52234502), we get a palindrome (72777727).

The spelling of 20543225 in words is "twenty million, five hundred forty-three thousand, two hundred twenty-five".