20847464 has 32 divisors (see below), whose sum is σ = 42863040. Its totient is φ = 9427200.

The previous prime is 20847451. The next prime is 20847481. The reversal of 20847464 is 46474802.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 20717 + ... + 21699.

It is an arithmetic number, because the mean of its divisors is an integer number (1339470).

Almost surely, 2^20847464 is an apocalyptic number.

It is an amenable number.

20847464 is an abundant number, since it is smaller than the sum of its proper divisors (22015576).

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

20847464 is a wasteful number, since it uses less digits than its factorization.

20847464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241 (or 1237 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 35.

The square root of 20847464 is about 4565.9023204620. The cubic root of 20847464 is about 275.2228012589. Note that the first 3 decimals are identical.

The spelling of 20847464 in words is "twenty million, eight hundred forty-seven thousand, four hundred sixty-four".