20641720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{1091}}^1$

素因数の和:1156

約数の個数: 64

約数和(自身を含む): 51891840

約数和(自身を除く): 31250120

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 43, 44, 55, 86, 88, 110, 172, 215, 220, 344, 430, 440, 473, 860, 946, 1091, 1720, 1892, 2182, 2365, 3784, 4364, 4730, 5455, 8728, 9460, 10910, 12001, 18920, 21820, 24002, 43640, 46913, 48004, 60005, 93826, 96008, 120010, 187652, 234565, 240020, 375304, 469130, 480040, 516043, 938260, 1032086, 1876520, 2064172, 2580215, 4128344, 5160430, 10320860, 20641720]

約数ペア:

[(1, 20641720), (2, 10320860), (4, 5160430), (5, 4128344), (8, 2580215), (10, 2064172), (11, 1876520), (20, 1032086), (22, 938260), (40, 516043), (43, 480040), (44, 469130), (55, 375304), (86, 240020), (88, 234565), (110, 187652), (172, 120010), (215, 96008), (220, 93826), (344, 60005), (430, 48004), (440, 46913), (473, 43640), (860, 24002), (946, 21820), (1091, 18920), (1720, 12001), (1892, 10910), (2182, 9460), (2365, 8728), (3784, 5455), (4364, 4730)]