20732138 has 16 divisors (see below), whose sum is σ = 35743680. Its totient is φ = 8834496.

The previous prime is 20732119. The next prime is 20732141. The reversal of 20732138 is 83123702.

It is a super-3 number, since 3×20732138³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 1631 + ... + 6642.

It is an arithmetic number, because the mean of its divisors is an integer number (2233980).

Almost surely, 2^20732138 is an apocalyptic number.

20732138 is a deficient number, since it is larger than the sum of its proper divisors (15011542).

20732138 is a wasteful number, since it uses less digits than its factorization.

20732138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8461.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 20732138 is about 4553.2557582460. The cubic root of 20732138 is about 274.7143612649.

It can be divided in two parts, 207 and 32138, that multiplied together give a palindrome (6652566).

The spelling of 20732138 in words is "twenty million, seven hundred thirty-two thousand, one hundred thirty-eight".