20385884 has 6 divisors (see below), whose sum is σ = 35675304. Its totient is φ = 10192940.

The previous prime is 20385851. The next prime is 20385887. The reversal of 20385884 is 48858302.

It is a super-2 number, since 2×20385884² = 831168532922912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20385887) 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 as a sum of consecutive naturals, namely, 2548232 + ... + 2548239.

It is an arithmetic number, because the mean of its divisors is an integer number (5945884).

Almost surely, 2^20385884 is an apocalyptic number.

It is an amenable number.

20385884 is a deficient number, since it is larger than the sum of its proper divisors (15289420).

20385884 is a wasteful number, since it uses less digits than its factorization.

20385884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096475 (or 5096473 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 20385884 is about 4515.0729783692. The cubic root of 20385884 is about 273.1764034078.

The spelling of 20385884 in words is "twenty million, three hundred eighty-five thousand, eight hundred eighty-four".