20287700 has 18 divisors (see below), whose sum is σ = 44024526. Its totient is φ = 8115040.

The previous prime is 20287637. The next prime is 20287703. The reversal of 20287700 is 778202.

It can be written as a sum of positive squares in 3 ways, for example, as 55696 + 20232004 = 236^2 + 4498^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20287700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20287703) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 101339 + ... + 101538.

It is an arithmetic number, because the mean of its divisors is an integer number (2445807).

Almost surely, 2^20287700 is an apocalyptic number.

20287700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20287700 is an abundant number, since it is smaller than the sum of its proper divisors (23736826).

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

20287700 is a wasteful number, since it uses less digits than its factorization.

20287700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202891 (or 202884 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 20287700 is about 4504.1869410583. The cubic root of 20287700 is about 272.7371333135.

The spelling of 20287700 in words is "twenty million, two hundred eighty-seven thousand, seven hundred".