19985180

素因数分解:

$2^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{113}}^1\times {\mathrm{239}}^1$

素因数の和:398

約数の個数: 48

約数和(自身を含む): 43666560

約数和(自身を除く): 23681380

約数列:

[1, 2, 4, 5, 10, 20, 37, 74, 113, 148, 185, 226, 239, 370, 452, 478, 565, 740, 956, 1130, 1195, 2260, 2390, 4181, 4780, 8362, 8843, 16724, 17686, 20905, 27007, 35372, 41810, 44215, 54014, 83620, 88430, 108028, 135035, 176860, 270070, 540140, 999259, 1998518, 3997036, 4996295, 9992590, 19985180]

約数ペア:

[(1, 19985180), (2, 9992590), (4, 4996295), (5, 3997036), (10, 1998518), (20, 999259), (37, 540140), (74, 270070), (113, 176860), (148, 135035), (185, 108028), (226, 88430), (239, 83620), (370, 54014), (452, 44215), (478, 41810), (565, 35372), (740, 27007), (956, 20905), (1130, 17686), (1195, 16724), (2260, 8843), (2390, 8362), (4181, 4780)]