20388132 has 24 divisors (see below), whose sum is σ = 52858400. Its totient is φ = 6796008.

The previous prime is 20388127. The next prime is 20388133. The reversal of 20388132 is 23188302.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 20388096 and 20388105.

It is not an unprimeable number, because it can be changed into a prime (20388133) 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 7 ways as a sum of consecutive naturals, for example, 94282 + ... + 94497.

Almost surely, 2^20388132 is an apocalyptic number.

It is an amenable number.

20388132 is an abundant number, since it is smaller than the sum of its proper divisors (32470268).

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

20388132 is a wasteful number, since it uses less digits than its factorization.

20388132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188792 (or 188784 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 20388132 is about 4515.3219154342. The cubic root of 20388132 is about 273.1864443097.

The spelling of 20388132 in words is "twenty million, three hundred eighty-eight thousand, one hundred thirty-two".