20847080 has 16 divisors (see below), whose sum is σ = 46906020. Its totient is φ = 8338816.

The previous prime is 20847067. The next prime is 20847133. The reversal of 20847080 is 8074802.

It can be written as a sum of positive squares in 2 ways, for example, as 20484676 + 362404 = 4526^2 + 602^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 260549 + ... + 260628.

Almost surely, 2^20847080 is an apocalyptic number.

20847080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20847080 is an abundant number, since it is smaller than the sum of its proper divisors (26058940).

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

20847080 is a wasteful number, since it uses less digits than its factorization.

20847080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521188 (or 521184 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 20847080 is about 4565.8602694344. The cubic root of 20847080 is about 275.2211114258.

The spelling of 20847080 in words is "twenty million, eight hundred forty-seven thousand, eighty".