20802556 has 12 divisors (see below), whose sum is σ = 36437800. Its totient is φ = 10391760.

The previous prime is 20802527. The next prime is 20802559. The reversal of 20802556 is 65520802.

It is a super-2 number, since 2×20802556² = 865492672266272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20802559) 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 3 ways as a sum of consecutive naturals, for example, 5266 + ... + 8326.

Almost surely, 2^20802556 is an apocalyptic number.

It is an amenable number.

20802556 is a deficient number, since it is larger than the sum of its proper divisors (15635244).

20802556 is a wasteful number, since it uses less digits than its factorization.

20802556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4764 (or 4762 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 20802556 is about 4560.9819118256. The cubic root of 20802556 is about 275.0250379407.

The spelling of 20802556 in words is "twenty million, eight hundred two thousand, five hundred fifty-six".