21705328

素因数分解:

$2^4\times {\mathrm{17}}^1\times {\mathrm{199}}^1\times {\mathrm{401}}^1$

素因数の和:625

約数の個数: 40

約数和(自身を含む): 44863200

約数和(自身を除く): 23157872

約数列:

[1, 2, 4, 8, 16, 17, 34, 68, 136, 199, 272, 398, 401, 796, 802, 1592, 1604, 3184, 3208, 3383, 6416, 6766, 6817, 13532, 13634, 27064, 27268, 54128, 54536, 79799, 109072, 159598, 319196, 638392, 1276784, 1356583, 2713166, 5426332, 10852664, 21705328]

約数ペア:

[(1, 21705328), (2, 10852664), (4, 5426332), (8, 2713166), (16, 1356583), (17, 1276784), (34, 638392), (68, 319196), (136, 159598), (199, 109072), (272, 79799), (398, 54536), (401, 54128), (796, 27268), (802, 27064), (1592, 13634), (1604, 13532), (3184, 6817), (3208, 6766), (3383, 6416)]