21008900

素因数分解:

$2^2\times 5^2\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{269}}^1$

素因数の和:365

約数の個数: 72

約数和(自身を含む): 50621760

約数和(自身を除く): 29612860

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 25, 44, 50, 55, 71, 100, 110, 142, 220, 269, 275, 284, 355, 538, 550, 710, 781, 1076, 1100, 1345, 1420, 1562, 1775, 2690, 2959, 3124, 3550, 3905, 5380, 5918, 6725, 7100, 7810, 11836, 13450, 14795, 15620, 19099, 19525, 26900, 29590, 38198, 39050, 59180, 73975, 76396, 78100, 95495, 147950, 190990, 210089, 295900, 381980, 420178, 477475, 840356, 954950, 1050445, 1909900, 2100890, 4201780, 5252225, 10504450, 21008900]

約数ペア:

[(1, 21008900), (2, 10504450), (4, 5252225), (5, 4201780), (10, 2100890), (11, 1909900), (20, 1050445), (22, 954950), (25, 840356), (44, 477475), (50, 420178), (55, 381980), (71, 295900), (100, 210089), (110, 190990), (142, 147950), (220, 95495), (269, 78100), (275, 76396), (284, 73975), (355, 59180), (538, 39050), (550, 38198), (710, 29590), (781, 26900), (1076, 19525), (1100, 19099), (1345, 15620), (1420, 14795), (1562, 13450), (1775, 11836), (2690, 7810), (2959, 7100), (3124, 6725), (3550, 5918), (3905, 5380)]