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20671164 = 22321947643
BaseRepresentation
bin100111011011…
…0101010111100
31102220012111200
41032312222330
520242434124
62015015500
7340462533
oct116665274
942805450
1020671164
1110739608
126b0a590
134389a77
142a6131a
151c34bc9
hex13b6abc

20671164 has 72 divisors (see below), whose sum is σ = 56259840. Its totient is φ = 6378912.

The previous prime is 20671163. The next prime is 20671187. The reversal of 20671164 is 46117602.

It is a super-2 number, since 2×206711642 = 854594042229792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20671163) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31827 + ... + 32469.

Almost surely, 220671164 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20671164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28129920).

20671164 is an abundant number, since it is smaller than the sum of its proper divisors (35588676).

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

20671164 is a wasteful number, since it uses less digits than its factorization.

20671164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719 (or 714 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 20671164 is about 4546.5551794738. Note that the first 3 decimals coincide. The cubic root of 20671164 is about 274.4447817106. Note that the first 3 decimals are identical.

Adding to 20671164 its reverse (46117602), we get a palindrome (66788766).

The spelling of 20671164 in words is "twenty million, six hundred seventy-one thousand, one hundred sixty-four".

Divisors: 1 2 3 4 6 9 12 18 19 36 38 47 57 76 94 114 141 171 188 228 282 342 423 564 643 684 846 893 1286 1692 1786 1929 2572 2679 3572 3858 5358 5787 7716 8037 10716 11574 12217 16074 23148 24434 30221 32148 36651 48868 60442 73302 90663 109953 120884 146604 181326 219906 271989 362652 439812 543978 574199 1087956 1148398 1722597 2296796 3445194 5167791 6890388 10335582 20671164