20138310 has 24 divisors (see below), whose sum is σ = 52359840. Its totient is φ = 5370192.

The previous prime is 20138303. The next prime is 20138311. The reversal of 20138310 is 1383102.

It is a super-2 number, since 2×20138310² = 811103059312200, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20138311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111790 + ... + 111969.

It is an arithmetic number, because the mean of its divisors is an integer number (2181660).

Almost surely, 2^20138310 is an apocalyptic number.

20138310 is an abundant number, since it is smaller than the sum of its proper divisors (32221530).

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

20138310 is a wasteful number, since it uses less digits than its factorization.

20138310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223772 (or 223769 counting only the distinct ones).

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

The square root of 20138310 is about 4487.5728406345. The cubic root of 20138310 is about 272.0660432911.

The spelling of 20138310 in words is "twenty million, one hundred thirty-eight thousand, three hundred ten".