20540000 has 120 divisors (see below), whose sum is σ = 55107360. Its totient is φ = 7488000.

The previous prime is 20539997. The next prime is 20540017. The reversal of 20540000 is 4502.

It is a congruent number.

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 19 ways as a sum of consecutive naturals, for example, 259961 + ... + 260039.

It is an arithmetic number, because the mean of its divisors is an integer number (459228).

Almost surely, 2^20540000 is an apocalyptic number.

20540000 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 20540000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27553680).

20540000 is an abundant number, since it is smaller than the sum of its proper divisors (34567360).

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

20540000 is an equidigital number, since it uses as much as digits as its factorization.

20540000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 99 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 11.

The square root of 20540000 is about 4532.1076774499. The cubic root of 20540000 is about 273.8630747122.

Adding to 20540000 its reverse (4502), we get a palindrome (20544502).

The spelling of 20540000 in words is "twenty million, five hundred forty thousand".