20857606 has 64 divisors (see below), whose sum is σ = 42799104. Its totient is φ = 7372800.

The previous prime is 20857601. The next prime is 20857609. The reversal of 20857606 is 60675802.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20857601) 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 in 31 ways as a sum of consecutive naturals, for example, 81030 + ... + 81286.

It is an arithmetic number, because the mean of its divisors is an integer number (668736).

Almost surely, 2^20857606 is an apocalyptic number.

20857606 is an abundant number, since it is smaller than the sum of its proper divisors (21941498).

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

20857606 is a wasteful number, since it uses less digits than its factorization.

20857606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 20857606 is about 4567.0128092660. The cubic root of 20857606 is about 275.2674247061.

The spelling of 20857606 in words is "twenty million, eight hundred fifty-seven thousand, six hundred six".