21389877

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{2909}}^1$

素因数の和:2977

約数の個数: 24

約数和(自身を含む): 33290400

約数和(自身を除く): 11900523

約数列:

[1, 3, 9, 19, 43, 57, 129, 171, 387, 817, 2451, 2909, 7353, 8727, 26181, 55271, 125087, 165813, 375261, 497439, 1125783, 2376653, 7129959, 21389877]

約数ペア:

[(1, 21389877), (3, 7129959), (9, 2376653), (19, 1125783), (43, 497439), (57, 375261), (129, 165813), (171, 125087), (387, 55271), (817, 26181), (2451, 8727), (2909, 7353)]