20685562 has 8 divisors (see below), whose sum is σ = 31144500. Its totient is φ = 10304064.

The previous prime is 20685559. The next prime is 20685569. The reversal of 20685562 is 26558602.

It can be written as a sum of positive squares in 2 ways, for example, as 13920361 + 6765201 = 3731^2 + 2601^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (20685569) 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, 18687 + ... + 19762.

Almost surely, 2^20685562 is an apocalyptic number.

20685562 is a deficient number, since it is larger than the sum of its proper divisors (10458938).

20685562 is a wasteful number, since it uses less digits than its factorization.

20685562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38720.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 20685562 is about 4548.1383004478. The cubic root of 20685562 is about 274.5084862169.

The spelling of 20685562 in words is "twenty million, six hundred eighty-five thousand, five hundred sixty-two".