21257475

素因数分解:

$3^1\times 5^2\times {\mathrm{31}}^1\times {\mathrm{41}}^1\times {\mathrm{223}}^1$

素因数の和:308

約数の個数: 48

約数和(自身を含む): 37330944

約数和(自身を除く): 16073469

約数列:

[1, 3, 5, 15, 25, 31, 41, 75, 93, 123, 155, 205, 223, 465, 615, 669, 775, 1025, 1115, 1271, 2325, 3075, 3345, 3813, 5575, 6355, 6913, 9143, 16725, 19065, 20739, 27429, 31775, 34565, 45715, 95325, 103695, 137145, 172825, 228575, 283433, 518475, 685725, 850299, 1417165, 4251495, 7085825, 21257475]

約数ペア:

[(1, 21257475), (3, 7085825), (5, 4251495), (15, 1417165), (25, 850299), (31, 685725), (41, 518475), (75, 283433), (93, 228575), (123, 172825), (155, 137145), (205, 103695), (223, 95325), (465, 45715), (615, 34565), (669, 31775), (775, 27429), (1025, 20739), (1115, 19065), (1271, 16725), (2325, 9143), (3075, 6913), (3345, 6355), (3813, 5575)]