20828356 has 6 divisors (see below), whose sum is σ = 36449630. Its totient is φ = 10414176.

The previous prime is 20828333. The next prime is 20828371. The reversal of 20828356 is 65382802.

It can be written as a sum of positive squares in only one way, i.e., 16892100 + 3936256 = 4110^2 + 1984^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2603541 + ... + 2603548.

Almost surely, 2^20828356 is an apocalyptic number.

It is an amenable number.

20828356 is a deficient number, since it is larger than the sum of its proper divisors (15621274).

20828356 is a wasteful number, since it uses less digits than its factorization.

20828356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207093 (or 5207091 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 20828356 is about 4563.8093737578. The cubic root of 20828356 is about 275.1386892725.

The spelling of 20828356 in words is "twenty million, eight hundred twenty-eight thousand, three hundred fifty-six".