20543504 has 10 divisors (see below), whose sum is σ = 39803070. Its totient is φ = 10271744.

The previous prime is 20543477. The next prime is 20543527. The reversal of 20543504 is 40534502.

It can be written as a sum of positive squares in only one way, i.e., 18905104 + 1638400 = 4348^2 + 1280^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20543504.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 641969 + ... + 642000.

It is an arithmetic number, because the mean of its divisors is an integer number (3980307).

Almost surely, 2^20543504 is an apocalyptic number.

It is an amenable number.

20543504 is a deficient number, since it is larger than the sum of its proper divisors (19259566).

20543504 is a wasteful number, since it uses less digits than its factorization.

20543504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1283977 (or 1283971 counting only the distinct ones).

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

The square root of 20543504 is about 4532.4942360691. The cubic root of 20543504 is about 273.8786469558.

The spelling of 20543504 in words is "twenty million, five hundred forty-three thousand, five hundred four".