20385544 has 24 divisors (see below), whose sum is σ = 39965310. Its totient is φ = 9747584.

The previous prime is 20385517. The next prime is 20385559. The reversal of 20385544 is 44558302.

It can be written as a sum of positive squares in only one way, i.e., 19909444 + 476100 = 4462^2 + 690^2 .

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 5 ways as a sum of consecutive naturals, for example, 1824 + ... + 6640.

Almost surely, 2^20385544 is an apocalyptic number.

It is an amenable number.

20385544 is a deficient number, since it is larger than the sum of its proper divisors (19579766).

20385544 is a wasteful number, since it uses less digits than its factorization.

20385544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869 (or 4842 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 20385544 is about 4515.0353265506. The cubic root of 20385544 is about 273.1748847018.

The spelling of 20385544 in words is "twenty million, three hundred eighty-five thousand, five hundred forty-four".