20564450 has 24 divisors (see below), whose sum is σ = 38903760. Its totient is φ = 8085200.

The previous prime is 20564431. The next prime is 20564459. The reversal of 20564450 is 5446502.

It is not an unprimeable number, because it can be changed into a prime (20564459) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 536 + ... + 6435.

It is an arithmetic number, because the mean of its divisors is an integer number (1620990).

Almost surely, 2^20564450 is an apocalyptic number.

20564450 is a deficient number, since it is larger than the sum of its proper divisors (18339310).

20564450 is a wasteful number, since it uses less digits than its factorization.

20564450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042 (or 7037 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 20564450 is about 4534.8042956670. The cubic root of 20564450 is about 273.9716968652.

The spelling of 20564450 in words is "twenty million, five hundred sixty-four thousand, four hundred fifty".