21205240

素因数分解:

$2^3\times 5^1\times 7^2\times {\mathrm{31}}^1\times {\mathrm{349}}^1$

素因数の和:405

約数の個数: 96

約数和(自身を含む): 57456000

約数和(自身を除く): 36250760

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 31, 35, 40, 49, 56, 62, 70, 98, 124, 140, 155, 196, 217, 245, 248, 280, 310, 349, 392, 434, 490, 620, 698, 868, 980, 1085, 1240, 1396, 1519, 1736, 1745, 1960, 2170, 2443, 2792, 3038, 3490, 4340, 4886, 6076, 6980, 7595, 8680, 9772, 10819, 12152, 12215, 13960, 15190, 17101, 19544, 21638, 24430, 30380, 34202, 43276, 48860, 54095, 60760, 68404, 75733, 85505, 86552, 97720, 108190, 136808, 151466, 171010, 216380, 302932, 342020, 378665, 432760, 530131, 605864, 684040, 757330, 1060262, 1514660, 2120524, 2650655, 3029320, 4241048, 5301310, 10602620, 21205240]

約数ペア:

[(1, 21205240), (2, 10602620), (4, 5301310), (5, 4241048), (7, 3029320), (8, 2650655), (10, 2120524), (14, 1514660), (20, 1060262), (28, 757330), (31, 684040), (35, 605864), (40, 530131), (49, 432760), (56, 378665), (62, 342020), (70, 302932), (98, 216380), (124, 171010), (140, 151466), (155, 136808), (196, 108190), (217, 97720), (245, 86552), (248, 85505), (280, 75733), (310, 68404), (349, 60760), (392, 54095), (434, 48860), (490, 43276), (620, 34202), (698, 30380), (868, 24430), (980, 21638), (1085, 19544), (1240, 17101), (1396, 15190), (1519, 13960), (1736, 12215), (1745, 12152), (1960, 10819), (2170, 9772), (2443, 8680), (2792, 7595), (3038, 6980), (3490, 6076), (4340, 4886)]