18667720

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{103}}^1\times {\mathrm{197}}^1$

素因数の和:334

約数の個数: 64

約数和(自身を含む): 44478720

約数和(自身を除く): 25811000

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 46, 92, 103, 115, 184, 197, 206, 230, 394, 412, 460, 515, 788, 824, 920, 985, 1030, 1576, 1970, 2060, 2369, 3940, 4120, 4531, 4738, 7880, 9062, 9476, 11845, 18124, 18952, 20291, 22655, 23690, 36248, 40582, 45310, 47380, 81164, 90620, 94760, 101455, 162328, 181240, 202910, 405820, 466693, 811640, 933386, 1866772, 2333465, 3733544, 4666930, 9333860, 18667720]

約数ペア:

[(1, 18667720), (2, 9333860), (4, 4666930), (5, 3733544), (8, 2333465), (10, 1866772), (20, 933386), (23, 811640), (40, 466693), (46, 405820), (92, 202910), (103, 181240), (115, 162328), (184, 101455), (197, 94760), (206, 90620), (230, 81164), (394, 47380), (412, 45310), (460, 40582), (515, 36248), (788, 23690), (824, 22655), (920, 20291), (985, 18952), (1030, 18124), (1576, 11845), (1970, 9476), (2060, 9062), (2369, 7880), (3940, 4738), (4120, 4531)]