21015740

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{113}}^1\times {\mathrm{547}}^1$

素因数の和:686

約数の個数: 48

約数和(自身を含む): 47228832

約数和(自身を除く): 26213092

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 68, 85, 113, 170, 226, 340, 452, 547, 565, 1094, 1130, 1921, 2188, 2260, 2735, 3842, 5470, 7684, 9299, 9605, 10940, 18598, 19210, 37196, 38420, 46495, 61811, 92990, 123622, 185980, 247244, 309055, 618110, 1050787, 1236220, 2101574, 4203148, 5253935, 10507870, 21015740]

約数ペア:

[(1, 21015740), (2, 10507870), (4, 5253935), (5, 4203148), (10, 2101574), (17, 1236220), (20, 1050787), (34, 618110), (68, 309055), (85, 247244), (113, 185980), (170, 123622), (226, 92990), (340, 61811), (452, 46495), (547, 38420), (565, 37196), (1094, 19210), (1130, 18598), (1921, 10940), (2188, 9605), (2260, 9299), (2735, 7684), (3842, 5470)]