21256725

素因数分解:

$3^1\times 5^2\times 7^1\times {\mathrm{19}}^1\times {\mathrm{2131}}^1$

素因数の和:2170

約数の個数: 48

約数和(自身を含む): 42298880

約数和(自身を除く): 21042155

約数列:

[1, 3, 5, 7, 15, 19, 21, 25, 35, 57, 75, 95, 105, 133, 175, 285, 399, 475, 525, 665, 1425, 1995, 2131, 3325, 6393, 9975, 10655, 14917, 31965, 40489, 44751, 53275, 74585, 121467, 159825, 202445, 223755, 283423, 372925, 607335, 850269, 1012225, 1118775, 1417115, 3036675, 4251345, 7085575, 21256725]

約数ペア:

[(1, 21256725), (3, 7085575), (5, 4251345), (7, 3036675), (15, 1417115), (19, 1118775), (21, 1012225), (25, 850269), (35, 607335), (57, 372925), (75, 283423), (95, 223755), (105, 202445), (133, 159825), (175, 121467), (285, 74585), (399, 53275), (475, 44751), (525, 40489), (665, 31965), (1425, 14917), (1995, 10655), (2131, 9975), (3325, 6393)]