21390915

素因数分解:

$3^1\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{15671}}^1$

素因数の和:15699

約数の個数: 32

約数和(自身を含む): 42126336

約数和(自身を除く): 20735421

約数列:

[1, 3, 5, 7, 13, 15, 21, 35, 39, 65, 91, 105, 195, 273, 455, 1365, 15671, 47013, 78355, 109697, 203723, 235065, 329091, 548485, 611169, 1018615, 1426061, 1645455, 3055845, 4278183, 7130305, 21390915]

約数ペア:

[(1, 21390915), (3, 7130305), (5, 4278183), (7, 3055845), (13, 1645455), (15, 1426061), (21, 1018615), (35, 611169), (39, 548485), (65, 329091), (91, 235065), (105, 203723), (195, 109697), (273, 78355), (455, 47013), (1365, 15671)]