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20758331 = 116912731
BaseRepresentation
bin100111100101…
…1111100111011
31110001122002002
41033023330323
520303231311
62020531215
7341304626
oct117137473
943048062
1020758331
1110799050
126b50b0b
1343ba649
142a84dbd
151c5093b
hex13cbf3b

20758331 has 8 divisors (see below), whose sum is σ = 22686528. Its totient is φ = 18837000.

The previous prime is 20758303. The next prime is 20758337. The reversal of 20758331 is 13385702.

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 20758331 - 214 = 20741947 is a prime.

It is a super-2 number, since 2×207583312 = 861816611811122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20758294 and 20758303.

It is not an unprimeable number, because it can be changed into a prime (20758337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6236 + ... + 8966.

It is an arithmetic number, because the mean of its divisors is an integer number (2835816).

Almost surely, 220758331 is an apocalyptic number.

20758331 is a deficient number, since it is larger than the sum of its proper divisors (1928197).

20758331 is a wasteful number, since it uses less digits than its factorization.

20758331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3433.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 20758331 is about 4556.1311438544. The cubic root of 20758331 is about 274.8300040266.

The spelling of 20758331 in words is "twenty million, seven hundred fifty-eight thousand, three hundred thirty-one".

Divisors: 1 11 691 2731 7601 30041 1887121 20758331