20540500 has 24 divisors (see below), whose sum is σ = 44861544. Its totient is φ = 8216000.

The previous prime is 20540491. The next prime is 20540503. The reversal of 20540500 is 504502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1285956 + 19254544 = 1134^2 + 4388^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20540503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20041 + ... + 21040.

It is an arithmetic number, because the mean of its divisors is an integer number (1869231).

Almost surely, 2^20540500 is an apocalyptic number.

20540500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20540500 is an abundant number, since it is smaller than the sum of its proper divisors (24321044).

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

20540500 is a wasteful number, since it uses less digits than its factorization.

20540500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41100 (or 41088 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 16.

The square root of 20540500 is about 4532.1628390869. The cubic root of 20540500 is about 273.8652968872.

The spelling of 20540500 in words is "twenty million, five hundred forty thousand, five hundred".