21378021

素因数分解:

$3^1\times 7^1\times {\mathrm{19}}^1\times {\mathrm{131}}^1\times {\mathrm{409}}^1$

素因数の和:569

約数の個数: 32

約数和(自身を含む): 34636800

約数和(自身を除く): 13258779

約数列:

[1, 3, 7, 19, 21, 57, 131, 133, 393, 399, 409, 917, 1227, 2489, 2751, 2863, 7467, 7771, 8589, 17423, 23313, 52269, 53579, 54397, 160737, 163191, 375053, 1018001, 1125159, 3054003, 7126007, 21378021]

約数ペア:

[(1, 21378021), (3, 7126007), (7, 3054003), (19, 1125159), (21, 1018001), (57, 375053), (131, 163191), (133, 160737), (393, 54397), (399, 53579), (409, 52269), (917, 23313), (1227, 17423), (2489, 8589), (2751, 7771), (2863, 7467)]