20856028 has 24 divisors (see below), whose sum is σ = 37699200. Its totient is φ = 10090608.

The previous prime is 20856023. The next prime is 20856029. The reversal of 20856028 is 82065802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20856023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15153 + ... + 16471.

It is an arithmetic number, because the mean of its divisors is an integer number (1570800).

Almost surely, 2^20856028 is an apocalyptic number.

It is an amenable number.

20856028 is a deficient number, since it is larger than the sum of its proper divisors (16843172).

20856028 is a wasteful number, since it uses less digits than its factorization.

20856028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449 (or 1447 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 20856028 is about 4566.8400453705. The cubic root of 20856028 is about 275.2604826670.

The spelling of 20856028 in words is "twenty million, eight hundred fifty-six thousand, twenty-eight".