640860

素因数分解:

$2^2\times 3^1\times 5^1\times {\mathrm{11}}^1\times {\mathrm{971}}^1$

素因数の和:994

約数の個数: 48

約数和(自身を含む): 1959552

約数和(自身を除く): 1318692

約数列:

[1, 2, 3, 4, 5, 6, 10, 11, 12, 15, 20, 22, 30, 33, 44, 55, 60, 66, 110, 132, 165, 220, 330, 660, 971, 1942, 2913, 3884, 4855, 5826, 9710, 10681, 11652, 14565, 19420, 21362, 29130, 32043, 42724, 53405, 58260, 64086, 106810, 128172, 160215, 213620, 320430, 640860]

約数ペア:

[(1, 640860), (2, 320430), (3, 213620), (4, 160215), (5, 128172), (6, 106810), (10, 64086), (11, 58260), (12, 53405), (15, 42724), (20, 32043), (22, 29130), (30, 21362), (33, 19420), (44, 14565), (55, 11652), (60, 10681), (66, 9710), (110, 5826), (132, 4855), (165, 3884), (220, 2913), (330, 1942), (660, 971)]