21988057

素因数分解:

$7^1\times {\mathrm{13}}^1\times {\mathrm{47}}^1\times {\mathrm{53}}^1\times {\mathrm{97}}^1$

素因数の和:217

約数の個数: 32

約数和(自身を含む): 28449792

約数和(自身を除く): 6461735

約数列:

[1, 7, 13, 47, 53, 91, 97, 329, 371, 611, 679, 689, 1261, 2491, 4277, 4559, 4823, 5141, 8827, 17437, 31913, 32383, 35987, 59267, 66833, 226681, 241627, 414869, 467831, 1691389, 3141151, 21988057]

約数ペア:

[(1, 21988057), (7, 3141151), (13, 1691389), (47, 467831), (53, 414869), (91, 241627), (97, 226681), (329, 66833), (371, 59267), (611, 35987), (679, 32383), (689, 31913), (1261, 17437), (2491, 8827), (4277, 5141), (4559, 4823)]