20981565

素因数分解:

$3^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{199}}^1$

素因数の和:295

約数の個数: 64

約数和(自身を含む): 41472000

約数和(自身を除く): 20490435

約数列:

[1, 3, 5, 9, 11, 15, 27, 33, 45, 55, 71, 99, 135, 165, 199, 213, 297, 355, 495, 597, 639, 781, 995, 1065, 1485, 1791, 1917, 2189, 2343, 2985, 3195, 3905, 5373, 6567, 7029, 8955, 9585, 10945, 11715, 14129, 19701, 21087, 26865, 32835, 35145, 42387, 59103, 70645, 98505, 105435, 127161, 155419, 211935, 295515, 381483, 466257, 635805, 777095, 1398771, 1907415, 2331285, 4196313, 6993855, 20981565]

約数ペア:

[(1, 20981565), (3, 6993855), (5, 4196313), (9, 2331285), (11, 1907415), (15, 1398771), (27, 777095), (33, 635805), (45, 466257), (55, 381483), (71, 295515), (99, 211935), (135, 155419), (165, 127161), (199, 105435), (213, 98505), (297, 70645), (355, 59103), (495, 42387), (597, 35145), (639, 32835), (781, 26865), (995, 21087), (1065, 19701), (1485, 14129), (1791, 11715), (1917, 10945), (2189, 9585), (2343, 8955), (2985, 7029), (3195, 6567), (3905, 5373)]