21215115

素因数分解:

$3^5\times 5^1\times {\mathrm{19}}^1\times {\mathrm{919}}^1$

素因数の和:958

約数の個数: 48

約数和(自身を含む): 40185600

約数和(自身を除く): 18970485

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 81, 95, 135, 171, 243, 285, 405, 513, 855, 919, 1215, 1539, 2565, 2757, 4595, 4617, 7695, 8271, 13785, 17461, 23085, 24813, 41355, 52383, 74439, 87305, 124065, 157149, 223317, 261915, 372195, 471447, 785745, 1116585, 1414341, 2357235, 4243023, 7071705, 21215115]

約数ペア:

[(1, 21215115), (3, 7071705), (5, 4243023), (9, 2357235), (15, 1414341), (19, 1116585), (27, 785745), (45, 471447), (57, 372195), (81, 261915), (95, 223317), (135, 157149), (171, 124065), (243, 87305), (285, 74439), (405, 52383), (513, 41355), (855, 24813), (919, 23085), (1215, 17461), (1539, 13785), (2565, 8271), (2757, 7695), (4595, 4617)]