21521720

素因数分解:

$2^3\times 5^1\times {\mathrm{11}}^1\times {\mathrm{41}}^1\times {\mathrm{1193}}^1$

素因数の和:1256

約数の個数: 64

約数和(自身を含む): 54159840

約数和(自身を除く): 32638120

約数列:

[1, 2, 4, 5, 8, 10, 11, 20, 22, 40, 41, 44, 55, 82, 88, 110, 164, 205, 220, 328, 410, 440, 451, 820, 902, 1193, 1640, 1804, 2255, 2386, 3608, 4510, 4772, 5965, 9020, 9544, 11930, 13123, 18040, 23860, 26246, 47720, 48913, 52492, 65615, 97826, 104984, 131230, 195652, 244565, 262460, 391304, 489130, 524920, 538043, 978260, 1076086, 1956520, 2152172, 2690215, 4304344, 5380430, 10760860, 21521720]

約数ペア:

[(1, 21521720), (2, 10760860), (4, 5380430), (5, 4304344), (8, 2690215), (10, 2152172), (11, 1956520), (20, 1076086), (22, 978260), (40, 538043), (41, 524920), (44, 489130), (55, 391304), (82, 262460), (88, 244565), (110, 195652), (164, 131230), (205, 104984), (220, 97826), (328, 65615), (410, 52492), (440, 48913), (451, 47720), (820, 26246), (902, 23860), (1193, 18040), (1640, 13123), (1804, 11930), (2255, 9544), (2386, 9020), (3608, 5965), (4510, 4772)]