20731338 has 48 divisors (see below), whose sum is σ = 46425600.
Its totient is φ = 6683040.
The previous prime is 20731327. The next prime is 20731339. The reversal of 20731338 is 83313702.
It is not an unprimeable number, because it can be changed into a prime (20731339) 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 23 ways as a sum of consecutive naturals, for example, 86623 + ... + 86861.
It is an arithmetic number, because the mean of its divisors is an integer number (967200).
Almost surely, 220731338 is an apocalyptic number.
20731338 is an abundant number, since it is smaller than the sum of its proper divisors (25694262).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
20731338 is a wasteful number, since it uses less digits than its factorization.
20731338 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 387 (or 384 counting only the distinct ones).
The product of its (nonzero) digits is 3024, while the sum is 27.
The square root of 20731338 is about 4553.1679081712.
The cubic root of 20731338 is about 274.7108277121.
The spelling of 20731338 in words is "twenty million, seven hundred thirty-one thousand, three hundred thirty-eight".