21720249

素因数分解:

$3^2\times {\mathrm{19}}^1\times {\mathrm{71}}^1\times {\mathrm{1789}}^1$

素因数の和:1885

約数の個数: 24

約数和(自身を含む): 33508800

約数和(自身を除く): 11788551

約数列:

[1, 3, 9, 19, 57, 71, 171, 213, 639, 1349, 1789, 4047, 5367, 12141, 16101, 33991, 101973, 127019, 305919, 381057, 1143171, 2413361, 7240083, 21720249]

約数ペア:

[(1, 21720249), (3, 7240083), (9, 2413361), (19, 1143171), (57, 381057), (71, 305919), (171, 127019), (213, 101973), (639, 33991), (1349, 16101), (1789, 12141), (4047, 5367)]