20118540 has 48 divisors (see below), whose sum is σ = 60667488. Its totient is φ = 4952064.

The previous prime is 20118533. The next prime is 20118541. The reversal of 20118540 is 4581102.

It is not an unprimeable number, because it can be changed into a prime (20118541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12117 + ... + 13676.

It is an arithmetic number, because the mean of its divisors is an integer number (1263906).

Almost surely, 2^20118540 is an apocalyptic number.

20118540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20118540 is an abundant number, since it is smaller than the sum of its proper divisors (40548948).

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

20118540 is a wasteful number, since it uses less digits than its factorization.

20118540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25818 (or 25816 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 20118540 is about 4485.3695499925. The cubic root of 20118540 is about 271.9769840675.

Adding to 20118540 its reverse (4581102), we get a palindrome (24699642).

The spelling of 20118540 in words is "twenty million, one hundred eighteen thousand, five hundred forty".