20828655 has 48 divisors (see below), whose sum is σ = 40266720. Its totient is φ = 9897984.

The previous prime is 20828653. The next prime is 20828657. The reversal of 20828655 is 55682802.

It is an interprime number because it is at equal distance from previous prime (20828653) and next prime (20828657).

It is not a de Polignac number, because 20828655 - 2¹ = 20828653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20828651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13819 + ... + 15251.

It is an arithmetic number, because the mean of its divisors is an integer number (838890).

Almost surely, 2^20828655 is an apocalyptic number.

20828655 is a deficient number, since it is larger than the sum of its proper divisors (19438065).

20828655 is a wasteful number, since it uses less digits than its factorization.

20828655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1480 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The square root of 20828655 is about 4563.8421313626. The cubic root of 20828655 is about 275.1400058442.

The spelling of 20828655 in words is "twenty million, eight hundred twenty-eight thousand, six hundred fifty-five".