20539218 has 32 divisors (see below), whose sum is σ = 48219264. Its totient is φ = 5709312.

The previous prime is 20539217. The next prime is 20539223. The reversal of 20539218 is 81293502.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20539217) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5055 + ... + 8162.

It is an arithmetic number, because the mean of its divisors is an integer number (1506852).

Almost surely, 2^20539218 is an apocalyptic number.

20539218 is an abundant number, since it is smaller than the sum of its proper divisors (27680046).

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

20539218 is a wasteful number, since it uses less digits than its factorization.

20539218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13266.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 20539218 is about 4532.0214033034. The cubic root of 20539218 is about 273.8595991581.

The spelling of 20539218 in words is "twenty million, five hundred thirty-nine thousand, two hundred eighteen".