21312680

素因数分解:

$2^3\times 5^1\times {\mathrm{19}}^1\times {\mathrm{29}}^1\times {\mathrm{967}}^1$

素因数の和:1026

約数の個数: 64

約数和(自身を含む): 52272000

約数和(自身を除く): 30959320

約数列:

[1, 2, 4, 5, 8, 10, 19, 20, 29, 38, 40, 58, 76, 95, 116, 145, 152, 190, 232, 290, 380, 551, 580, 760, 967, 1102, 1160, 1934, 2204, 2755, 3868, 4408, 4835, 5510, 7736, 9670, 11020, 18373, 19340, 22040, 28043, 36746, 38680, 56086, 73492, 91865, 112172, 140215, 146984, 183730, 224344, 280430, 367460, 532817, 560860, 734920, 1065634, 1121720, 2131268, 2664085, 4262536, 5328170, 10656340, 21312680]

約数ペア:

[(1, 21312680), (2, 10656340), (4, 5328170), (5, 4262536), (8, 2664085), (10, 2131268), (19, 1121720), (20, 1065634), (29, 734920), (38, 560860), (40, 532817), (58, 367460), (76, 280430), (95, 224344), (116, 183730), (145, 146984), (152, 140215), (190, 112172), (232, 91865), (290, 73492), (380, 56086), (551, 38680), (580, 36746), (760, 28043), (967, 22040), (1102, 19340), (1160, 18373), (1934, 11020), (2204, 9670), (2755, 7736), (3868, 5510), (4408, 4835)]