21397940

素因数分解:

$2^2\times 5^1\times {\mathrm{29}}^1\times {\mathrm{79}}^1\times {\mathrm{467}}^1$

素因数の和:584

約数の個数: 48

約数和(自身を含む): 47174400

約数和(自身を除く): 25776460

約数列:

[1, 2, 4, 5, 10, 20, 29, 58, 79, 116, 145, 158, 290, 316, 395, 467, 580, 790, 934, 1580, 1868, 2291, 2335, 4582, 4670, 9164, 9340, 11455, 13543, 22910, 27086, 36893, 45820, 54172, 67715, 73786, 135430, 147572, 184465, 270860, 368930, 737860, 1069897, 2139794, 4279588, 5349485, 10698970, 21397940]

約数ペア:

[(1, 21397940), (2, 10698970), (4, 5349485), (5, 4279588), (10, 2139794), (20, 1069897), (29, 737860), (58, 368930), (79, 270860), (116, 184465), (145, 147572), (158, 135430), (290, 73786), (316, 67715), (395, 54172), (467, 45820), (580, 36893), (790, 27086), (934, 22910), (1580, 13543), (1868, 11455), (2291, 9340), (2335, 9164), (4582, 4670)]