21178520

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{127}}^1\times {\mathrm{379}}^1$

素因数の和:528

約数の個数: 64

約数和(自身を含む): 52531200

約数和(自身を除く): 31352680

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 44, 55, 88, 110, 127, 220, 254, 379, 440, 508, 635, 758, 1016, 1270, 1397, 1516, 1895, 2540, 2794, 3032, 3790, 4169, 5080, 5588, 6985, 7580, 8338, 11176, 13970, 15160, 16676, 20845, 27940, 33352, 41690, 48133, 55880, 83380, 96266, 166760, 192532, 240665, 385064, 481330, 529463, 962660, 1058926, 1925320, 2117852, 2647315, 4235704, 5294630, 10589260, 21178520]

約数ペア:

[(1, 21178520), (2, 10589260), (4, 5294630), (5, 4235704), (8, 2647315), (10, 2117852), (11, 1925320), (20, 1058926), (22, 962660), (40, 529463), (44, 481330), (55, 385064), (88, 240665), (110, 192532), (127, 166760), (220, 96266), (254, 83380), (379, 55880), (440, 48133), (508, 41690), (635, 33352), (758, 27940), (1016, 20845), (1270, 16676), (1397, 15160), (1516, 13970), (1895, 11176), (2540, 8338), (2794, 7580), (3032, 6985), (3790, 5588), (4169, 5080)]