21131320

素因数分解:

$2^3\times 5^1\times 7^1\times {\mathrm{163}}^1\times {\mathrm{463}}^1$

素因数の和:644

約数の個数: 64

約数和(自身を含む): 54789120

約数和(自身を除く): 33657800

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 20, 28, 35, 40, 56, 70, 140, 163, 280, 326, 463, 652, 815, 926, 1141, 1304, 1630, 1852, 2282, 2315, 3241, 3260, 3704, 4564, 4630, 5705, 6482, 6520, 9128, 9260, 11410, 12964, 16205, 18520, 22820, 25928, 32410, 45640, 64820, 75469, 129640, 150938, 301876, 377345, 528283, 603752, 754690, 1056566, 1509380, 2113132, 2641415, 3018760, 4226264, 5282830, 10565660, 21131320]

約数ペア:

[(1, 21131320), (2, 10565660), (4, 5282830), (5, 4226264), (7, 3018760), (8, 2641415), (10, 2113132), (14, 1509380), (20, 1056566), (28, 754690), (35, 603752), (40, 528283), (56, 377345), (70, 301876), (140, 150938), (163, 129640), (280, 75469), (326, 64820), (463, 45640), (652, 32410), (815, 25928), (926, 22820), (1141, 18520), (1304, 16205), (1630, 12964), (1852, 11410), (2282, 9260), (2315, 9128), (3241, 6520), (3260, 6482), (3704, 5705), (4564, 4630)]