20823628 has 18 divisors (see below), whose sum is σ = 42391356. Its totient is φ = 8924328.

The previous prime is 20823619. The next prime is 20823643. The reversal of 20823628 is 82632802.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 20823628.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52926 + ... + 53317.

Almost surely, 2^20823628 is an apocalyptic number.

20823628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20823628 is an abundant number, since it is smaller than the sum of its proper divisors (21567728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20823628 is a wasteful number, since it uses less digits than its factorization.

20823628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106261 (or 106252 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 20823628 is about 4563.2913560280. The cubic root of 20823628 is about 275.1178690316.

The spelling of 20823628 in words is "twenty million, eight hundred twenty-three thousand, six hundred twenty-eight".