21146980

素因数分解:

$2^2\times 5^1\times {\mathrm{17}}^1\times {\mathrm{37}}^1\times {\mathrm{41}}^2$

素因数の和:145

約数の個数: 72

約数和(自身を含む): 49498344

約数和(自身を除く): 28351364

約数列:

[1, 2, 4, 5, 10, 17, 20, 34, 37, 41, 68, 74, 82, 85, 148, 164, 170, 185, 205, 340, 370, 410, 629, 697, 740, 820, 1258, 1394, 1517, 1681, 2516, 2788, 3034, 3145, 3362, 3485, 6068, 6290, 6724, 6970, 7585, 8405, 12580, 13940, 15170, 16810, 25789, 28577, 30340, 33620, 51578, 57154, 62197, 103156, 114308, 124394, 128945, 142885, 248788, 257890, 285770, 310985, 515780, 571540, 621970, 1057349, 1243940, 2114698, 4229396, 5286745, 10573490, 21146980]

約数ペア:

[(1, 21146980), (2, 10573490), (4, 5286745), (5, 4229396), (10, 2114698), (17, 1243940), (20, 1057349), (34, 621970), (37, 571540), (41, 515780), (68, 310985), (74, 285770), (82, 257890), (85, 248788), (148, 142885), (164, 128945), (170, 124394), (185, 114308), (205, 103156), (340, 62197), (370, 57154), (410, 51578), (629, 33620), (697, 30340), (740, 28577), (820, 25789), (1258, 16810), (1394, 15170), (1517, 13940), (1681, 12580), (2516, 8405), (2788, 7585), (3034, 6970), (3145, 6724), (3362, 6290), (3485, 6068)]