20138510 has 48 divisors (see below), whose sum is σ = 42821136. Its totient is φ = 6797952.

The previous prime is 20138507. The next prime is 20138527. The reversal of 20138510 is 1583102.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 35489 + ... + 36051.

It is an arithmetic number, because the mean of its divisors is an integer number (892107).

Almost surely, 2^20138510 is an apocalyptic number.

20138510 is an abundant number, since it is smaller than the sum of its proper divisors (22682626).

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

20138510 is a wasteful number, since it uses less digits than its factorization.

20138510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 20138510 is about 4487.5951243400. The cubic root of 20138510 is about 272.0669439465.

The spelling of 20138510 in words is "twenty million, one hundred thirty-eight thousand, five hundred ten".