21813309

素因数分解:

$3^2\times 7^1\times {\mathrm{151}}^1\times {\mathrm{2293}}^1$

素因数の和:2457

約数の個数: 24

約数和(自身を含む): 36263552

約数和(自身を除く): 14450243

約数列:

[1, 3, 7, 9, 21, 63, 151, 453, 1057, 1359, 2293, 3171, 6879, 9513, 16051, 20637, 48153, 144459, 346243, 1038729, 2423701, 3116187, 7271103, 21813309]

約数ペア:

[(1, 21813309), (3, 7271103), (7, 3116187), (9, 2423701), (21, 1038729), (63, 346243), (151, 144459), (453, 48153), (1057, 20637), (1359, 16051), (2293, 9513), (3171, 6879)]