21157155

素因数分解:

$3^2\times 5^1\times {\mathrm{37}}^1\times {\mathrm{97}}^1\times {\mathrm{131}}^1$

素因数の和:276

約数の個数: 48

約数和(自身を含む): 38342304

約数和(自身を除く): 17185149

約数列:

[1, 3, 5, 9, 15, 37, 45, 97, 111, 131, 185, 291, 333, 393, 485, 555, 655, 873, 1179, 1455, 1665, 1965, 3589, 4365, 4847, 5895, 10767, 12707, 14541, 17945, 24235, 32301, 38121, 43623, 53835, 63535, 72705, 114363, 161505, 190605, 218115, 470159, 571815, 1410477, 2350795, 4231431, 7052385, 21157155]

約数ペア:

[(1, 21157155), (3, 7052385), (5, 4231431), (9, 2350795), (15, 1410477), (37, 571815), (45, 470159), (97, 218115), (111, 190605), (131, 161505), (185, 114363), (291, 72705), (333, 63535), (393, 53835), (485, 43623), (555, 38121), (655, 32301), (873, 24235), (1179, 17945), (1455, 14541), (1665, 12707), (1965, 10767), (3589, 5895), (4365, 4847)]