21215775

素因数分解:

$3^1\times 5^2\times 7^2\times {\mathrm{23}}^1\times {\mathrm{251}}^1$

素因数の和:301

約数の個数: 72

約数和(自身を含む): 42747264

約数和(自身を除く): 21531489

約数列:

[1, 3, 5, 7, 15, 21, 23, 25, 35, 49, 69, 75, 105, 115, 147, 161, 175, 245, 251, 345, 483, 525, 575, 735, 753, 805, 1127, 1225, 1255, 1725, 1757, 2415, 3381, 3675, 3765, 4025, 5271, 5635, 5773, 6275, 8785, 12075, 12299, 16905, 17319, 18825, 26355, 28175, 28865, 36897, 40411, 43925, 61495, 84525, 86595, 121233, 131775, 144325, 184485, 202055, 282877, 307475, 432975, 606165, 848631, 922425, 1010275, 1414385, 3030825, 4243155, 7071925, 21215775]

約数ペア:

[(1, 21215775), (3, 7071925), (5, 4243155), (7, 3030825), (15, 1414385), (21, 1010275), (23, 922425), (25, 848631), (35, 606165), (49, 432975), (69, 307475), (75, 282877), (105, 202055), (115, 184485), (147, 144325), (161, 131775), (175, 121233), (245, 86595), (251, 84525), (345, 61495), (483, 43925), (525, 40411), (575, 36897), (735, 28865), (753, 28175), (805, 26355), (1127, 18825), (1225, 17319), (1255, 16905), (1725, 12299), (1757, 12075), (2415, 8785), (3381, 6275), (3675, 5773), (3765, 5635), (4025, 5271)]