20005515

素因数分解:

$3^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{23}}^1\times {\mathrm{379}}^1$

素因数の和:433

約数の個数: 64

約数和(自身を含む): 39398400

約数和(自身を除く): 19392885

約数列:

[1, 3, 5, 9, 15, 17, 23, 27, 45, 51, 69, 85, 115, 135, 153, 207, 255, 345, 379, 391, 459, 621, 765, 1035, 1137, 1173, 1895, 1955, 2295, 3105, 3411, 3519, 5685, 5865, 6443, 8717, 10233, 10557, 17055, 17595, 19329, 26151, 32215, 43585, 51165, 52785, 57987, 78453, 96645, 130755, 148189, 173961, 235359, 289935, 392265, 444567, 740945, 869805, 1176795, 1333701, 2222835, 4001103, 6668505, 20005515]

約数ペア:

[(1, 20005515), (3, 6668505), (5, 4001103), (9, 2222835), (15, 1333701), (17, 1176795), (23, 869805), (27, 740945), (45, 444567), (51, 392265), (69, 289935), (85, 235359), (115, 173961), (135, 148189), (153, 130755), (207, 96645), (255, 78453), (345, 57987), (379, 52785), (391, 51165), (459, 43585), (621, 32215), (765, 26151), (1035, 19329), (1137, 17595), (1173, 17055), (1895, 10557), (1955, 10233), (2295, 8717), (3105, 6443), (3411, 5865), (3519, 5685)]