20506118 has 8 divisors (see below), whose sum is σ = 30831840. Its totient is φ = 10228840.

The previous prime is 20506093. The next prime is 20506151. The reversal of 20506118 is 81160502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 20506093 and 20506102.

It is a congruent number.

It is an unprimeable number.

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, 11033 + ... + 12756.

It is an arithmetic number, because the mean of its divisors is an integer number (3853980).

Almost surely, 2^20506118 is an apocalyptic number.

20506118 is a deficient number, since it is larger than the sum of its proper divisors (10325722).

20506118 is a wasteful number, since it uses less digits than its factorization.

20506118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24222.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 20506118 is about 4528.3681387449. The cubic root of 20506118 is about 273.7124071450.

The spelling of 20506118 in words is "twenty million, five hundred six thousand, one hundred eighteen".