20847708 has 36 divisors (see below), whose sum is σ = 60227440. Its totient is φ = 5956416.

The previous prime is 20847707. The next prime is 20847727. The reversal of 20847708 is 80774802.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847703) 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 11 ways as a sum of consecutive naturals, for example, 41113 + ... + 41616.

Almost surely, 2^20847708 is an apocalyptic number.

20847708 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

20847708 is an abundant number, since it is smaller than the sum of its proper divisors (39379732).

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

20847708 is a wasteful number, since it uses less digits than its factorization.

20847708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82746 (or 82741 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 20847708 is about 4565.9290401845. The cubic root of 20847708 is about 275.2238749962.

The spelling of 20847708 in words is "twenty million, eight hundred forty-seven thousand, seven hundred eight".