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20847494 = 233730931
BaseRepresentation
bin100111110000…
…1101110000110
31110020011101102
41033201232012
520314104434
62022500102
7342125603
oct117415606
943204342
1020847494
111084a038
126b94632
13441c0c5
142aa96aa
151c6c07e
hex13e1b86

20847494 has 8 divisors (see below), whose sum is σ = 31365048. Its totient is φ = 10392480.

The previous prime is 20847493. The next prime is 20847523. The reversal of 20847494 is 49474802.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20847493) 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 3 ways as a sum of consecutive naturals, for example, 14792 + ... + 16139.

It is an arithmetic number, because the mean of its divisors is an integer number (3920631).

Almost surely, 220847494 is an apocalyptic number.

20847494 is a deficient number, since it is larger than the sum of its proper divisors (10517554).

20847494 is a wasteful number, since it uses less digits than its factorization.

20847494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31270.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 20847494 is about 4565.9056056822. The cubic root of 20847494 is about 275.2229332762. Note that the first 3 decimals are identical.

The spelling of 20847494 in words is "twenty million, eight hundred forty-seven thousand, four hundred ninety-four".

Divisors: 1 2 337 674 30931 61862 10423747 20847494