21491871

素因数分解:

$3^1\times {\mathrm{29}}^1\times {\mathrm{53}}^1\times {\mathrm{59}}^1\times {\mathrm{79}}^1$

素因数の和:223

約数の個数: 32

約数和(自身を含む): 31104000

約数和(自身を除く): 9612129

約数列:

[1, 3, 29, 53, 59, 79, 87, 159, 177, 237, 1537, 1711, 2291, 3127, 4187, 4611, 4661, 5133, 6873, 9381, 12561, 13983, 90683, 121423, 135169, 247033, 272049, 364269, 405507, 741099, 7163957, 21491871]

約数ペア:

[(1, 21491871), (3, 7163957), (29, 741099), (53, 405507), (59, 364269), (79, 272049), (87, 247033), (159, 135169), (177, 121423), (237, 90683), (1537, 13983), (1711, 12561), (2291, 9381), (3127, 6873), (4187, 5133), (4611, 4661)]