20543450 has 24 divisors (see below), whose sum is σ = 38468892. Its totient is φ = 8161920.

The previous prime is 20543443. The next prime is 20543459. The reversal of 20543450 is 5434502.

It can be written as a sum of positive squares in 6 ways, for example, as 11621281 + 8922169 = 3409^2 + 2987^2 .

It is not an unprimeable number, because it can be changed into a prime (20543459) 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, 6542 + ... + 9158.

Almost surely, 2^20543450 is an apocalyptic number.

20543450 is a deficient number, since it is larger than the sum of its proper divisors (17925442).

20543450 is a wasteful number, since it uses less digits than its factorization.

20543450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2786 (or 2781 counting only the distinct ones).

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

The square root of 20543450 is about 4532.4882790803. The cubic root of 20543450 is about 273.8784069860.

Adding to 20543450 its reverse (5434502), we get a palindrome (25977952).

The spelling of 20543450 in words is "twenty million, five hundred forty-three thousand, four hundred fifty".