20004920

素因数分解:

$2^3\times 5^1\times {\mathrm{13}}^1\times {\mathrm{17}}^1\times {\mathrm{31}}^1\times {\mathrm{73}}^1$

素因数の和:145

約数の個数: 128

約数和(自身を含む): 53706240

約数和(自身を除く): 33701320

約数列:

[1, 2, 4, 5, 8, 10, 13, 17, 20, 26, 31, 34, 40, 52, 62, 65, 68, 73, 85, 104, 124, 130, 136, 146, 155, 170, 221, 248, 260, 292, 310, 340, 365, 403, 442, 520, 527, 584, 620, 680, 730, 806, 884, 949, 1054, 1105, 1240, 1241, 1460, 1612, 1768, 1898, 2015, 2108, 2210, 2263, 2482, 2635, 2920, 3224, 3796, 4030, 4216, 4420, 4526, 4745, 4964, 5270, 6205, 6851, 7592, 8060, 8840, 9052, 9490, 9928, 10540, 11315, 12410, 13702, 16120, 16133, 18104, 18980, 21080, 22630, 24820, 27404, 29419, 32266, 34255, 37960, 38471, 45260, 49640, 54808, 58838, 64532, 68510, 76942, 80665, 90520, 117676, 129064, 137020, 147095, 153884, 161330, 192355, 235352, 274040, 294190, 307768, 322660, 384710, 500123, 588380, 645320, 769420, 1000246, 1176760, 1538840, 2000492, 2500615, 4000984, 5001230, 10002460, 20004920]

約数ペア:

[(1, 20004920), (2, 10002460), (4, 5001230), (5, 4000984), (8, 2500615), (10, 2000492), (13, 1538840), (17, 1176760), (20, 1000246), (26, 769420), (31, 645320), (34, 588380), (40, 500123), (52, 384710), (62, 322660), (65, 307768), (68, 294190), (73, 274040), (85, 235352), (104, 192355), (124, 161330), (130, 153884), (136, 147095), (146, 137020), (155, 129064), (170, 117676), (221, 90520), (248, 80665), (260, 76942), (292, 68510), (310, 64532), (340, 58838), (365, 54808), (403, 49640), (442, 45260), (520, 38471), (527, 37960), (584, 34255), (620, 32266), (680, 29419), (730, 27404), (806, 24820), (884, 22630), (949, 21080), (1054, 18980), (1105, 18104), (1240, 16133), (1241, 16120), (1460, 13702), (1612, 12410), (1768, 11315), (1898, 10540), (2015, 9928), (2108, 9490), (2210, 9052), (2263, 8840), (2482, 8060), (2635, 7592), (2920, 6851), (3224, 6205), (3796, 5270), (4030, 4964), (4216, 4745), (4420, 4526)]