20012540 has 24 divisors (see below), whose sum is σ = 42502320. Its totient is φ = 7914368.

The previous prime is 20012479. The next prime is 20012543. The reversal of 20012540 is 4521002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012543) 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, 3842 + ... + 7401.

It is an arithmetic number, because the mean of its divisors is an integer number (1770930).

Almost surely, 2^20012540 is an apocalyptic number.

20012540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012540 is an abundant number, since it is smaller than the sum of its proper divisors (22489780).

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

20012540 is a wasteful number, since it uses less digits than its factorization.

20012540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11341 (or 11339 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 20012540 is about 4473.5377499245. The cubic root of 20012540 is about 271.4984811350.

Adding to 20012540 its reverse (4521002), we get a palindrome (24533542).

The spelling of 20012540 in words is "twenty million, twelve thousand, five hundred forty".