20113518 has 16 divisors (see below), whose sum is σ = 40522320. Its totient is φ = 6655296.

The previous prime is 20113507. The next prime is 20113537. The reversal of 20113518 is 81531102.

It is a junction number, because it is equal to n+sod(n) for n = 20113494 and 20113503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11413 + ... + 13056.

It is an arithmetic number, because the mean of its divisors is an integer number (2532645).

Almost surely, 2^20113518 is an apocalyptic number.

20113518 is an abundant number, since it is smaller than the sum of its proper divisors (20408802).

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

20113518 is a wasteful number, since it uses less digits than its factorization.

20113518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24611.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 20113518 is about 4484.8096949592. The cubic root of 20113518 is about 271.9543518407.

The spelling of 20113518 in words is "twenty million, one hundred thirteen thousand, five hundred eighteen".