20717385 has 16 divisors (see below), whose sum is σ = 35697984. Its totient is φ = 10199232.

The previous prime is 20717377. The next prime is 20717387. The reversal of 20717385 is 58371702.

It is not a de Polignac number, because 20717385 - 2³ = 20717377 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20717387) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 52927 + ... + 53316.

It is an arithmetic number, because the mean of its divisors is an integer number (2231124).

Almost surely, 2^20717385 is an apocalyptic number.

It is an amenable number.

20717385 is a deficient number, since it is larger than the sum of its proper divisors (14980599).

20717385 is a wasteful number, since it uses less digits than its factorization.

20717385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106264.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 20717385 is about 4551.6354203736. The cubic root of 20717385 is about 274.6491835090.

The spelling of 20717385 in words is "twenty million, seven hundred seventeen thousand, three hundred eighty-five".