20311138 has 8 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 9827940.

The previous prime is 20311129. The next prime is 20311177. The reversal of 20311138 is 83111302.

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

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 3 ways as a sum of consecutive naturals, for example, 163738 + ... + 163861.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^20311138 is an apocalyptic number.

20311138 is a deficient number, since it is larger than the sum of its proper divisors (11138462).

20311138 is a wasteful number, since it uses less digits than its factorization.

20311138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327632.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 20311138 is about 4506.7879914635. The cubic root of 20311138 is about 272.8421222614.

It can be divided in two parts, 20311 and 138, that added together give a square (20449 = 143²).

The spelling of 20311138 in words is "twenty million, three hundred eleven thousand, one hundred thirty-eight".