21204120

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25243}}^1$

素因数の和:25264

約数の個数: 64

約数和(自身を含む): 72702720

約数和(自身を除く): 51498600

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25243, 50486, 75729, 100972, 126215, 151458, 176701, 201944, 252430, 302916, 353402, 378645, 504860, 530103, 605832, 706804, 757290, 883505, 1009720, 1060206, 1413608, 1514580, 1767010, 2120412, 2650515, 3029160, 3534020, 4240824, 5301030, 7068040, 10602060, 21204120]

約数ペア:

[(1, 21204120), (2, 10602060), (3, 7068040), (4, 5301030), (5, 4240824), (6, 3534020), (7, 3029160), (8, 2650515), (10, 2120412), (12, 1767010), (14, 1514580), (15, 1413608), (20, 1060206), (21, 1009720), (24, 883505), (28, 757290), (30, 706804), (35, 605832), (40, 530103), (42, 504860), (56, 378645), (60, 353402), (70, 302916), (84, 252430), (105, 201944), (120, 176701), (140, 151458), (168, 126215), (210, 100972), (280, 75729), (420, 50486), (840, 25243)]