21353960

素因数分解:

$2^3\times 5^1\times {\mathrm{71}}^1\times {\mathrm{73}}^1\times {\mathrm{103}}^1$

素因数の和:258

約数の個数: 64

約数和(自身を含む): 49870080

約数和(自身を除く): 28516120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 71, 73, 103, 142, 146, 206, 284, 292, 355, 365, 412, 515, 568, 584, 710, 730, 824, 1030, 1420, 1460, 2060, 2840, 2920, 4120, 5183, 7313, 7519, 10366, 14626, 15038, 20732, 25915, 29252, 30076, 36565, 37595, 41464, 51830, 58504, 60152, 73130, 75190, 103660, 146260, 150380, 207320, 292520, 300760, 533849, 1067698, 2135396, 2669245, 4270792, 5338490, 10676980, 21353960]

約数ペア:

[(1, 21353960), (2, 10676980), (4, 5338490), (5, 4270792), (8, 2669245), (10, 2135396), (20, 1067698), (40, 533849), (71, 300760), (73, 292520), (103, 207320), (142, 150380), (146, 146260), (206, 103660), (284, 75190), (292, 73130), (355, 60152), (365, 58504), (412, 51830), (515, 41464), (568, 37595), (584, 36565), (710, 30076), (730, 29252), (824, 25915), (1030, 20732), (1420, 15038), (1460, 14626), (2060, 10366), (2840, 7519), (2920, 7313), (4120, 5183)]