18520520

素因数分解:

$2^3\times 5^1\times {\mathrm{23}}^1\times {\mathrm{41}}^1\times {\mathrm{491}}^1$

素因数の和:566

約数の個数: 64

約数和(自身を含む): 44634240

約数和(自身を除く): 26113720

約数列:

[1, 2, 4, 5, 8, 10, 20, 23, 40, 41, 46, 82, 92, 115, 164, 184, 205, 230, 328, 410, 460, 491, 820, 920, 943, 982, 1640, 1886, 1964, 2455, 3772, 3928, 4715, 4910, 7544, 9430, 9820, 11293, 18860, 19640, 20131, 22586, 37720, 40262, 45172, 56465, 80524, 90344, 100655, 112930, 161048, 201310, 225860, 402620, 451720, 463013, 805240, 926026, 1852052, 2315065, 3704104, 4630130, 9260260, 18520520]

約数ペア:

[(1, 18520520), (2, 9260260), (4, 4630130), (5, 3704104), (8, 2315065), (10, 1852052), (20, 926026), (23, 805240), (40, 463013), (41, 451720), (46, 402620), (82, 225860), (92, 201310), (115, 161048), (164, 112930), (184, 100655), (205, 90344), (230, 80524), (328, 56465), (410, 45172), (460, 40262), (491, 37720), (820, 22586), (920, 20131), (943, 19640), (982, 18860), (1640, 11293), (1886, 9820), (1964, 9430), (2455, 7544), (3772, 4910), (3928, 4715)]