20568500 has 48 divisors (see below), whose sum is σ = 46405632. Its totient is φ = 7956000.

The previous prime is 20568497. The next prime is 20568533. The reversal of 20568500 is 586502.

It is a self number, because there is not a number n which added to its sum of digits gives 20568500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14837 + ... + 16163.

It is an arithmetic number, because the mean of its divisors is an integer number (966784).

Almost surely, 2^20568500 is an apocalyptic number.

20568500 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 20568500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23202816).

20568500 is an abundant number, since it is smaller than the sum of its proper divisors (25837132).

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

20568500 is a wasteful number, since it uses less digits than its factorization.

20568500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 20568500 is about 4535.2508199657. The cubic root of 20568500 is about 273.9896811785.

The spelling of 20568500 in words is "twenty million, five hundred sixty-eight thousand, five hundred".