20206500 has 96 divisors (see below), whose sum is σ = 62025600. Its totient is φ = 5097600.

The previous prime is 20206493. The next prime is 20206577. The reversal of 20206500 is 560202.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 20206500.

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 31 ways as a sum of consecutive naturals, for example, 28146 + ... + 28854.

It is an arithmetic number, because the mean of its divisors is an integer number (646100).

Almost surely, 2^20206500 is an apocalyptic number.

20206500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20206500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31012800).

20206500 is an abundant number, since it is smaller than the sum of its proper divisors (41819100).

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

20206500 is a wasteful number, since it uses less digits than its factorization.

20206500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 20206500 is about 4495.1640681960. The cubic root of 20206500 is about 272.3727767930.

Adding to 20206500 its reverse (560202), we get a palindrome (20766702).

It can be divided in two parts, 20206 and 500, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 20206500 in words is "twenty million, two hundred six thousand, five hundred".