20557665

素因数分解:

$3^3\times 5^1\times {\mathrm{29}}^1\times {\mathrm{59}}^1\times {\mathrm{89}}^1$

素因数の和:191

約数の個数: 64

約数和(自身を含む): 38880000

約数和(自身を除く): 18322335

約数列:

[1, 3, 5, 9, 15, 27, 29, 45, 59, 87, 89, 135, 145, 177, 261, 267, 295, 435, 445, 531, 783, 801, 885, 1305, 1335, 1593, 1711, 2403, 2581, 2655, 3915, 4005, 5133, 5251, 7743, 7965, 8555, 12015, 12905, 15399, 15753, 23229, 25665, 26255, 38715, 46197, 47259, 69687, 76995, 78765, 116145, 141777, 152279, 230985, 236295, 348435, 456837, 708885, 761395, 1370511, 2284185, 4111533, 6852555, 20557665]

約数ペア:

[(1, 20557665), (3, 6852555), (5, 4111533), (9, 2284185), (15, 1370511), (27, 761395), (29, 708885), (45, 456837), (59, 348435), (87, 236295), (89, 230985), (135, 152279), (145, 141777), (177, 116145), (261, 78765), (267, 76995), (295, 69687), (435, 47259), (445, 46197), (531, 38715), (783, 26255), (801, 25665), (885, 23229), (1305, 15753), (1335, 15399), (1593, 12905), (1711, 12015), (2403, 8555), (2581, 7965), (2655, 7743), (3915, 5251), (4005, 5133)]