20388536 has 32 divisors (see below), whose sum is σ = 44711040. Its totient is φ = 8533728.

The previous prime is 20388509. The next prime is 20388547. The reversal of 20388536 is 63588302.

It is a junction number, because it is equal to n+sod(n) for n = 20388496 and 20388505.

It is a congruent 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, 1826 + ... + 6641.

It is an arithmetic number, because the mean of its divisors is an integer number (1397220).

Almost surely, 2^20388536 is an apocalyptic number.

It is an amenable number.

20388536 is an abundant number, since it is smaller than the sum of its proper divisors (24322504).

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

20388536 is a wasteful number, since it uses less digits than its factorization.

20388536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8523 (or 8519 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 20388536 is about 4515.3666517792. The cubic root of 20388536 is about 273.1882487351.

The spelling of 20388536 in words is "twenty million, three hundred eighty-eight thousand, five hundred thirty-six".