20828763 has 12 divisors (see below), whose sum is σ = 30379440. Its totient is φ = 13750416.

The previous prime is 20828761. The next prime is 20828783. The reversal of 20828763 is 36782802.

It is a happy number.

It is not a de Polignac number, because 20828763 - 2¹ = 20828761 is a prime.

It is a super-2 number, since 2×20828763² = 867674736220338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20828761) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10308 + ... + 12161.

It is an arithmetic number, because the mean of its divisors is an integer number (2531620).

Almost surely, 2^20828763 is an apocalyptic number.

20828763 is a deficient number, since it is larger than the sum of its proper divisors (9550677).

20828763 is a wasteful number, since it uses less digits than its factorization.

20828763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22578 (or 22575 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 20828763 is about 4563.8539634831. The cubic root of 20828763 is about 275.1404813921.

The spelling of 20828763 in words is "twenty million, eight hundred twenty-eight thousand, seven hundred sixty-three".