20022820 has 24 divisors (see below), whose sum is σ = 42384384. Its totient is φ = 7945056.

The previous prime is 20022797. The next prime is 20022833. The reversal of 20022820 is 2822002.

It is a junction number, because it is equal to n+sod(n) for n = 20022794 and 20022803.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1402 + ... + 6481.

It is an arithmetic number, because the mean of its divisors is an integer number (1766016).

Almost surely, 2^20022820 is an apocalyptic number.

20022820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20022820 is an abundant number, since it is smaller than the sum of its proper divisors (22361564).

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

20022820 is a wasteful number, since it uses less digits than its factorization.

20022820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8019 (or 8017 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 20022820 is about 4474.6865812032. The cubic root of 20022820 is about 271.5449607694.

Adding to 20022820 its reverse (2822002), we get a palindrome (22844822).

The spelling of 20022820 in words is "twenty million, twenty-two thousand, eight hundred twenty".