21217980

素因数分解:

$2^2\times 3^1\times 5^1\times 7^3\times {\mathrm{1031}}^1$

素因数の和:1064

約数の個数: 96

約数和(自身を含む): 69350400

約数和(自身を除く): 48132420

約数列:

[1, 2, 3, 4, 5, 6, 7, 10, 12, 14, 15, 20, 21, 28, 30, 35, 42, 49, 60, 70, 84, 98, 105, 140, 147, 196, 210, 245, 294, 343, 420, 490, 588, 686, 735, 980, 1029, 1031, 1372, 1470, 1715, 2058, 2062, 2940, 3093, 3430, 4116, 4124, 5145, 5155, 6186, 6860, 7217, 10290, 10310, 12372, 14434, 15465, 20580, 20620, 21651, 28868, 30930, 36085, 43302, 50519, 61860, 72170, 86604, 101038, 108255, 144340, 151557, 202076, 216510, 252595, 303114, 353633, 433020, 505190, 606228, 707266, 757785, 1010380, 1060899, 1414532, 1515570, 1768165, 2121798, 3031140, 3536330, 4243596, 5304495, 7072660, 10608990, 21217980]

約数ペア:

[(1, 21217980), (2, 10608990), (3, 7072660), (4, 5304495), (5, 4243596), (6, 3536330), (7, 3031140), (10, 2121798), (12, 1768165), (14, 1515570), (15, 1414532), (20, 1060899), (21, 1010380), (28, 757785), (30, 707266), (35, 606228), (42, 505190), (49, 433020), (60, 353633), (70, 303114), (84, 252595), (98, 216510), (105, 202076), (140, 151557), (147, 144340), (196, 108255), (210, 101038), (245, 86604), (294, 72170), (343, 61860), (420, 50519), (490, 43302), (588, 36085), (686, 30930), (735, 28868), (980, 21651), (1029, 20620), (1031, 20580), (1372, 15465), (1470, 14434), (1715, 12372), (2058, 10310), (2062, 10290), (2940, 7217), (3093, 6860), (3430, 6186), (4116, 5155), (4124, 5145)]