20450140 has 12 divisors (see below), whose sum is σ = 42945336. Its totient is φ = 8180048.

The previous prime is 20450117. The next prime is 20450141. The reversal of 20450140 is 4105402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20450141) 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 3 ways as a sum of consecutive naturals, for example, 511234 + ... + 511273.

It is an arithmetic number, because the mean of its divisors is an integer number (3578778).

Almost surely, 2^20450140 is an apocalyptic number.

20450140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20450140 is an abundant number, since it is smaller than the sum of its proper divisors (22495196).

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

20450140 is a wasteful number, since it uses less digits than its factorization.

20450140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022516 (or 1022514 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 20450140 is about 4522.1831011139. The cubic root of 20450140 is about 273.4631183508.

Adding to 20450140 its reverse (4105402), we get a palindrome (24555542).

The spelling of 20450140 in words is "twenty million, four hundred fifty thousand, one hundred forty".