21248760

素因数分解:

$2^3\times 3^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{257}}^1$

素因数の和:337

約数の個数: 128

約数和(自身を含む): 70217280

約数和(自身を除く): 48968520

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 13, 15, 20, 24, 26, 30, 39, 40, 52, 53, 60, 65, 78, 104, 106, 120, 130, 156, 159, 195, 212, 257, 260, 265, 312, 318, 390, 424, 514, 520, 530, 636, 689, 771, 780, 795, 1028, 1060, 1272, 1285, 1378, 1542, 1560, 1590, 2056, 2067, 2120, 2570, 2756, 3084, 3180, 3341, 3445, 3855, 4134, 5140, 5512, 6168, 6360, 6682, 6890, 7710, 8268, 10023, 10280, 10335, 13364, 13621, 13780, 15420, 16536, 16705, 20046, 20670, 26728, 27242, 27560, 30840, 33410, 40092, 40863, 41340, 50115, 54484, 66820, 68105, 80184, 81726, 82680, 100230, 108968, 133640, 136210, 163452, 177073, 200460, 204315, 272420, 326904, 354146, 400920, 408630, 531219, 544840, 708292, 817260, 885365, 1062438, 1416584, 1634520, 1770730, 2124876, 2656095, 3541460, 4249752, 5312190, 7082920, 10624380, 21248760]

約数ペア:

[(1, 21248760), (2, 10624380), (3, 7082920), (4, 5312190), (5, 4249752), (6, 3541460), (8, 2656095), (10, 2124876), (12, 1770730), (13, 1634520), (15, 1416584), (20, 1062438), (24, 885365), (26, 817260), (30, 708292), (39, 544840), (40, 531219), (52, 408630), (53, 400920), (60, 354146), (65, 326904), (78, 272420), (104, 204315), (106, 200460), (120, 177073), (130, 163452), (156, 136210), (159, 133640), (195, 108968), (212, 100230), (257, 82680), (260, 81726), (265, 80184), (312, 68105), (318, 66820), (390, 54484), (424, 50115), (514, 41340), (520, 40863), (530, 40092), (636, 33410), (689, 30840), (771, 27560), (780, 27242), (795, 26728), (1028, 20670), (1060, 20046), (1272, 16705), (1285, 16536), (1378, 15420), (1542, 13780), (1560, 13621), (1590, 13364), (2056, 10335), (2067, 10280), (2120, 10023), (2570, 8268), (2756, 7710), (3084, 6890), (3180, 6682), (3341, 6360), (3445, 6168), (3855, 5512), (4134, 5140)]