20563412 has 6 divisors (see below), whose sum is σ = 35985978. Its totient is φ = 10281704.

The previous prime is 20563399. The next prime is 20563457. The reversal of 20563412 is 21436502.

It can be written as a sum of positive squares in only one way, i.e., 12292036 + 8271376 = 3506^2 + 2876^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2570423 + ... + 2570430.

It is an arithmetic number, because the mean of its divisors is an integer number (5997663).

Almost surely, 2^20563412 is an apocalyptic number.

It is an amenable number.

20563412 is a deficient number, since it is larger than the sum of its proper divisors (15422566).

20563412 is a wasteful number, since it uses less digits than its factorization.

20563412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5140857 (or 5140855 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 20563412 is about 4534.6898460644. The cubic root of 20563412 is about 273.9670871721.

Adding to 20563412 its reverse (21436502), we get a palindrome (41999914).

The spelling of 20563412 in words is "twenty million, five hundred sixty-three thousand, four hundred twelve".