21481760

素因数分解:

$2^5\times 5^1\times {\mathrm{31}}^1\times {\mathrm{61}}^1\times {\mathrm{71}}^1$

素因数の和:178

約数の個数: 96

約数和(自身を含む): 53996544

約数和(自身を除く): 32514784

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 31, 32, 40, 61, 62, 71, 80, 122, 124, 142, 155, 160, 244, 248, 284, 305, 310, 355, 488, 496, 568, 610, 620, 710, 976, 992, 1136, 1220, 1240, 1420, 1891, 1952, 2201, 2272, 2440, 2480, 2840, 3782, 4331, 4402, 4880, 4960, 5680, 7564, 8662, 8804, 9455, 9760, 11005, 11360, 15128, 17324, 17608, 18910, 21655, 22010, 30256, 34648, 35216, 37820, 43310, 44020, 60512, 69296, 70432, 75640, 86620, 88040, 134261, 138592, 151280, 173240, 176080, 268522, 302560, 346480, 352160, 537044, 671305, 692960, 1074088, 1342610, 2148176, 2685220, 4296352, 5370440, 10740880, 21481760]

約数ペア:

[(1, 21481760), (2, 10740880), (4, 5370440), (5, 4296352), (8, 2685220), (10, 2148176), (16, 1342610), (20, 1074088), (31, 692960), (32, 671305), (40, 537044), (61, 352160), (62, 346480), (71, 302560), (80, 268522), (122, 176080), (124, 173240), (142, 151280), (155, 138592), (160, 134261), (244, 88040), (248, 86620), (284, 75640), (305, 70432), (310, 69296), (355, 60512), (488, 44020), (496, 43310), (568, 37820), (610, 35216), (620, 34648), (710, 30256), (976, 22010), (992, 21655), (1136, 18910), (1220, 17608), (1240, 17324), (1420, 15128), (1891, 11360), (1952, 11005), (2201, 9760), (2272, 9455), (2440, 8804), (2480, 8662), (2840, 7564), (3782, 5680), (4331, 4960), (4402, 4880)]