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20421344 = 251494283
BaseRepresentation
bin100110111100…
…1101011100000
31102102111211002
41031321223200
520211440334
62005411132
7335402306
oct115715340
942374732
1020421344
1110588949
126a09aa8
134300148
1429d8276
151bd5b7e
hex1379ae0

20421344 has 24 divisors (see below), whose sum is σ = 40483800. Its totient is φ = 10139776.

The previous prime is 20421337. The next prime is 20421347. The reversal of 20421344 is 44312402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421347) 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, 2627 + ... + 6909.

It is an arithmetic number, because the mean of its divisors is an integer number (1686825).

Almost surely, 220421344 is an apocalyptic number.

It is an amenable number.

20421344 is a deficient number, since it is larger than the sum of its proper divisors (20062456).

20421344 is a wasteful number, since it uses less digits than its factorization.

20421344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4442 (or 4434 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 20421344 is about 4518.9981190525. The cubic root of 20421344 is about 273.3347028816.

Adding to 20421344 its reverse (44312402), we get a palindrome (64733746).

The spelling of 20421344 in words is "twenty million, four hundred twenty-one thousand, three hundred forty-four".

Divisors: 1 2 4 8 16 32 149 298 596 1192 2384 4283 4768 8566 17132 34264 68528 137056 638167 1276334 2552668 5105336 10210672 20421344