20978055

素因数分解:

$3^3\times 5^1\times 7^1\times {\mathrm{79}}^1\times {\mathrm{281}}^1$

素因数の和:381

約数の個数: 64

約数和(自身を含む): 43315200

約数和(自身を除く): 22337145

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 79, 105, 135, 189, 237, 281, 315, 395, 553, 711, 843, 945, 1185, 1405, 1659, 1967, 2133, 2529, 2765, 3555, 4215, 4977, 5901, 7587, 8295, 9835, 10665, 12645, 14931, 17703, 22199, 24885, 29505, 37935, 53109, 66597, 74655, 88515, 110995, 155393, 199791, 265545, 332985, 466179, 599373, 776965, 998955, 1398537, 2330895, 2996865, 4195611, 6992685, 20978055]

約数ペア:

[(1, 20978055), (3, 6992685), (5, 4195611), (7, 2996865), (9, 2330895), (15, 1398537), (21, 998955), (27, 776965), (35, 599373), (45, 466179), (63, 332985), (79, 265545), (105, 199791), (135, 155393), (189, 110995), (237, 88515), (281, 74655), (315, 66597), (395, 53109), (553, 37935), (711, 29505), (843, 24885), (945, 22199), (1185, 17703), (1405, 14931), (1659, 12645), (1967, 10665), (2133, 9835), (2529, 8295), (2765, 7587), (3555, 5901), (4215, 4977)]