21004095

素因数分解:

$3^1\times 5^1\times 7^2\times {\mathrm{17}}^1\times {\mathrm{41}}^2$

素因数の和:121

約数の個数: 72

約数和(自身を含む): 42427152

約数和(自身を除く): 21423057

約数列:

[1, 3, 5, 7, 15, 17, 21, 35, 41, 49, 51, 85, 105, 119, 123, 147, 205, 245, 255, 287, 357, 595, 615, 697, 735, 833, 861, 1435, 1681, 1785, 2009, 2091, 2499, 3485, 4165, 4305, 4879, 5043, 6027, 8405, 10045, 10455, 11767, 12495, 14637, 24395, 25215, 28577, 30135, 34153, 35301, 58835, 73185, 82369, 85731, 102459, 142885, 170765, 176505, 200039, 247107, 411845, 428655, 512295, 600117, 1000195, 1235535, 1400273, 3000585, 4200819, 7001365, 21004095]

約数ペア:

[(1, 21004095), (3, 7001365), (5, 4200819), (7, 3000585), (15, 1400273), (17, 1235535), (21, 1000195), (35, 600117), (41, 512295), (49, 428655), (51, 411845), (85, 247107), (105, 200039), (119, 176505), (123, 170765), (147, 142885), (205, 102459), (245, 85731), (255, 82369), (287, 73185), (357, 58835), (595, 35301), (615, 34153), (697, 30135), (735, 28577), (833, 25215), (861, 24395), (1435, 14637), (1681, 12495), (1785, 11767), (2009, 10455), (2091, 10045), (2499, 8405), (3485, 6027), (4165, 5043), (4305, 4879)]