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20320311 = 311615767
BaseRepresentation
bin100110110000…
…1000000110111
31102020101020010
41031201000313
520200222221
62003311303
7334501614
oct115410067
942211203
1020320311
1110519a50
12697b533
13429616b
1429ad50b
151bb5c76
hex1361037

20320311 has 8 divisors (see below), whose sum is σ = 29556864. Its totient is φ = 12315320.

The previous prime is 20320303. The next prime is 20320343. The reversal of 20320311 is 11302302.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20320311 - 23 = 20320303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20320361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307851 + ... + 307916.

It is an arithmetic number, because the mean of its divisors is an integer number (3694608).

Almost surely, 220320311 is an apocalyptic number.

20320311 is a deficient number, since it is larger than the sum of its proper divisors (9236553).

20320311 is a wasteful number, since it uses less digits than its factorization.

20320311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615781.

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 20320311 is about 4507.8055636862. The cubic root of 20320311 is about 272.8831901081.

Adding to 20320311 its reverse (11302302), we get a palindrome (31622613).

Subtracting from 20320311 its reverse (11302302), we obtain a square (9018009 = 30032).

The spelling of 20320311 in words is "twenty million, three hundred twenty thousand, three hundred eleven".

Divisors: 1 3 11 33 615767 1847301 6773437 20320311