20385716 has 12 divisors (see below), whose sum is σ = 38419332. Its totient is φ = 9408768.

The previous prime is 20385697. The next prime is 20385719. The reversal of 20385716 is 61758302.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1060900 + 19324816 = 1030^2 + 4396^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20385719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195965 + ... + 196068.

It is an arithmetic number, because the mean of its divisors is an integer number (3201611).

Almost surely, 2^20385716 is an apocalyptic number.

20385716 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

20385716 is a deficient number, since it is larger than the sum of its proper divisors (18033616).

20385716 is a wasteful number, since it uses less digits than its factorization.

20385716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392050 (or 392048 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 20385716 is about 4515.0543739805. The cubic root of 20385716 is about 273.1756529905.

The spelling of 20385716 in words is "twenty million, three hundred eighty-five thousand, seven hundred sixteen".