20828553 has 8 divisors (see below), whose sum is σ = 29405088. Its totient is φ = 13068864.

The previous prime is 20828551. The next prime is 20828597. The reversal of 20828553 is 35582802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20828553 - 2¹ = 20828551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20828551) 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 7 ways as a sum of consecutive naturals, for example, 204151 + ... + 204252.

It is an arithmetic number, because the mean of its divisors is an integer number (3675636).

Almost surely, 2^20828553 is an apocalyptic number.

It is an amenable number.

20828553 is a deficient number, since it is larger than the sum of its proper divisors (8576535).

20828553 is a wasteful number, since it uses less digits than its factorization.

20828553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408423.

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 20828553 is about 4563.8309565539. The cubic root of 20828553 is about 275.1395567141.

The spelling of 20828553 in words is "twenty million, eight hundred twenty-eight thousand, five hundred fifty-three".