20157708 has 24 divisors (see below), whose sum is σ = 49510720. Its totient is φ = 6365520.

The previous prime is 20157707. The next prime is 20157737. The reversal of 20157708 is 80775102.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (20157707) 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 7 ways as a sum of consecutive naturals, for example, 43978 + ... + 44433.

Almost surely, 2^20157708 is an apocalyptic number.

It is an amenable number.

20157708 is an abundant number, since it is smaller than the sum of its proper divisors (29353012).

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

20157708 is a wasteful number, since it uses less digits than its factorization.

20157708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88437 (or 88435 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 20157708 is about 4489.7336223879. The cubic root of 20157708 is about 272.1533701076.

The spelling of 20157708 in words is "twenty million, one hundred fifty-seven thousand, seven hundred eight".