20450540 has 24 divisors (see below), whose sum is σ = 46850832. Its totient is φ = 7436480.

The previous prime is 20450531. The next prime is 20450543. The reversal of 20450540 is 4505402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (20450543) 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 7 ways as a sum of consecutive naturals, for example, 46259 + ... + 46698.

It is an arithmetic number, because the mean of its divisors is an integer number (1952118).

Almost surely, 2^20450540 is an apocalyptic number.

20450540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20450540 is an abundant number, since it is smaller than the sum of its proper divisors (26400292).

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

20450540 is a wasteful number, since it uses less digits than its factorization.

20450540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92977 (or 92975 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 20450540 is about 4522.2273273244. The cubic root of 20450540 is about 273.4649012975.

Adding to 20450540 its reverse (4505402), we get a palindrome (24955942).

The spelling of 20450540 in words is "twenty million, four hundred fifty thousand, five hundred forty".