20115438 has 32 divisors (see below), whose sum is σ = 46129920. Its totient is φ = 5728320.

The previous prime is 20115413. The next prime is 20115439. The reversal of 20115438 is 83451102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20115439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16593 + ... + 17763.

It is an arithmetic number, because the mean of its divisors is an integer number (1441560).

Almost surely, 2^20115438 is an apocalyptic number.

20115438 is an abundant number, since it is smaller than the sum of its proper divisors (26014482).

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

20115438 is a wasteful number, since it uses less digits than its factorization.

20115438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1592.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 20115438 is about 4485.0237457565. The cubic root of 20115438 is about 271.9630049887.

The spelling of 20115438 in words is "twenty million, one hundred fifteen thousand, four hundred thirty-eight".