20103138 has 24 divisors (see below), whose sum is σ = 47516976. Its totient is φ = 6091800.

The previous prime is 20103137. The next prime is 20103143. The reversal of 20103138 is 83130102.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 20103138.

It is not an unprimeable number, because it can be changed into a prime (20103137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50568 + ... + 50963.

It is an arithmetic number, because the mean of its divisors is an integer number (1979874).

Almost surely, 2^20103138 is an apocalyptic number.

20103138 is an abundant number, since it is smaller than the sum of its proper divisors (27413838).

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

20103138 is a wasteful number, since it uses less digits than its factorization.

20103138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101550 (or 101547 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 20103138 is about 4483.6523058774. The cubic root of 20103138 is about 271.9075612210.

The spelling of 20103138 in words is "twenty million, one hundred three thousand, one hundred thirty-eight".