21280140

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{16889}}^1$

素因数の和:16911

約数の個数: 72

約数和(自身を含む): 73775520

約数和(自身を除く): 52495380

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 16889, 33778, 50667, 67556, 84445, 101334, 118223, 152001, 168890, 202668, 236446, 253335, 304002, 337780, 354669, 472892, 506670, 591115, 608004, 709338, 760005, 1013340, 1064007, 1182230, 1418676, 1520010, 1773345, 2128014, 2364460, 3040020, 3546690, 4256028, 5320035, 7093380, 10640070, 21280140]

約数ペア:

[(1, 21280140), (2, 10640070), (3, 7093380), (4, 5320035), (5, 4256028), (6, 3546690), (7, 3040020), (9, 2364460), (10, 2128014), (12, 1773345), (14, 1520010), (15, 1418676), (18, 1182230), (20, 1064007), (21, 1013340), (28, 760005), (30, 709338), (35, 608004), (36, 591115), (42, 506670), (45, 472892), (60, 354669), (63, 337780), (70, 304002), (84, 253335), (90, 236446), (105, 202668), (126, 168890), (140, 152001), (180, 118223), (210, 101334), (252, 84445), (315, 67556), (420, 50667), (630, 33778), (1260, 16889)]