20560784 has 10 divisors (see below), whose sum is σ = 39836550. Its totient is φ = 10280384.

The previous prime is 20560703. The next prime is 20560807. The reversal of 20560784 is 48706502.

It can be written as a sum of positive squares in only one way, i.e., 13162384 + 7398400 = 3628^2 + 2720^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20560784.

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, 642509 + ... + 642540.

It is an arithmetic number, because the mean of its divisors is an integer number (3983655).

Almost surely, 2^20560784 is an apocalyptic number.

It is an amenable number.

20560784 is a deficient number, since it is larger than the sum of its proper divisors (19275766).

20560784 is a wasteful number, since it uses less digits than its factorization.

20560784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285057 (or 1285051 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 20560784 is about 4534.4000705716. The cubic root of 20560784 is about 273.9554156950.

The spelling of 20560784 in words is "twenty million, five hundred sixty thousand, seven hundred eighty-four".