21161660

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{199}}^1\times {\mathrm{409}}^1$

素因数の和:630

約数の個数: 48

約数和(自身を含む): 48216000

約数和(自身を除く): 27054340

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 52, 65, 130, 199, 260, 398, 409, 796, 818, 995, 1636, 1990, 2045, 2587, 3980, 4090, 5174, 5317, 8180, 10348, 10634, 12935, 21268, 25870, 26585, 51740, 53170, 81391, 106340, 162782, 325564, 406955, 813910, 1058083, 1627820, 2116166, 4232332, 5290415, 10580830, 21161660]

約数ペア:

[(1, 21161660), (2, 10580830), (4, 5290415), (5, 4232332), (10, 2116166), (13, 1627820), (20, 1058083), (26, 813910), (52, 406955), (65, 325564), (130, 162782), (199, 106340), (260, 81391), (398, 53170), (409, 51740), (796, 26585), (818, 25870), (995, 21268), (1636, 12935), (1990, 10634), (2045, 10348), (2587, 8180), (3980, 5317), (4090, 5174)]