21245380

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{41}}^1\times {\mathrm{1993}}^1$

素因数の和:2056

約数の個数: 48

約数和(自身を含む): 49243824

約数和(自身を除く): 27998444

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 41, 52, 65, 82, 130, 164, 205, 260, 410, 533, 820, 1066, 1993, 2132, 2665, 3986, 5330, 7972, 9965, 10660, 19930, 25909, 39860, 51818, 81713, 103636, 129545, 163426, 259090, 326852, 408565, 518180, 817130, 1062269, 1634260, 2124538, 4249076, 5311345, 10622690, 21245380]

約数ペア:

[(1, 21245380), (2, 10622690), (4, 5311345), (5, 4249076), (10, 2124538), (13, 1634260), (20, 1062269), (26, 817130), (41, 518180), (52, 408565), (65, 326852), (82, 259090), (130, 163426), (164, 129545), (205, 103636), (260, 81713), (410, 51818), (533, 39860), (820, 25909), (1066, 19930), (1993, 10660), (2132, 9965), (2665, 7972), (3986, 5330)]