20206820 has 24 divisors (see below), whose sum is σ = 42721728. Its totient is φ = 8028000.

The previous prime is 20206819. The next prime is 20206853. The reversal of 20206820 is 2860202.

20206820 = T₄₄₀ + T₄₄₁ + ... + T₅₉₀.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 20206792 and 20206801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326 + ... + 6365.

It is an arithmetic number, because the mean of its divisors is an integer number (1780072).

Almost surely, 2^20206820 is an apocalyptic number.

20206820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20206820 is an abundant number, since it is smaller than the sum of its proper divisors (22514908).

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

20206820 is a wasteful number, since it uses less digits than its factorization.

20206820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6851 (or 6849 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 20206820 is about 4495.1996618615. The cubic root of 20206820 is about 272.3742145949.

The spelling of 20206820 in words is "twenty million, two hundred six thousand, eight hundred twenty".