20818360

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{103}}^1\times {\mathrm{163}}^1$

素因数の和:308

約数の個数: 64

約数和(自身を含む): 49121280

約数和(自身を除く): 28302920

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 103, 124, 155, 163, 206, 248, 310, 326, 412, 515, 620, 652, 815, 824, 1030, 1240, 1304, 1630, 2060, 3193, 3260, 4120, 5053, 6386, 6520, 10106, 12772, 15965, 16789, 20212, 25265, 25544, 31930, 33578, 40424, 50530, 63860, 67156, 83945, 101060, 127720, 134312, 167890, 202120, 335780, 520459, 671560, 1040918, 2081836, 2602295, 4163672, 5204590, 10409180, 20818360]

約数ペア:

[(1, 20818360), (2, 10409180), (4, 5204590), (5, 4163672), (8, 2602295), (10, 2081836), (20, 1040918), (31, 671560), (40, 520459), (62, 335780), (103, 202120), (124, 167890), (155, 134312), (163, 127720), (206, 101060), (248, 83945), (310, 67156), (326, 63860), (412, 50530), (515, 40424), (620, 33578), (652, 31930), (815, 25544), (824, 25265), (1030, 20212), (1240, 16789), (1304, 15965), (1630, 12772), (2060, 10106), (3193, 6520), (3260, 6386), (4120, 5053)]