20438216 has 32 divisors (see below), whose sum is σ = 41199840. Its totient is φ = 9470208.

The previous prime is 20438203. The next prime is 20438219. The reversal of 20438216 is 61283402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20438219) 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, 7991 + ... + 10233.

It is an arithmetic number, because the mean of its divisors is an integer number (1287495).

Almost surely, 2^20438216 is an apocalyptic number.

It is an amenable number.

20438216 is an abundant number, since it is smaller than the sum of its proper divisors (20761624).

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

20438216 is a wasteful number, since it uses less digits than its factorization.

20438216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2333 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 20438216 is about 4520.8645190937. The cubic root of 20438216 is about 273.4099580270.

The spelling of 20438216 in words is "twenty million, four hundred thirty-eight thousand, two hundred sixteen".