20721505

素因数分解:

$5^1\times 7^1\times {\mathrm{23}}^1\times {\mathrm{25741}}^1$

素因数の和:25776

約数の個数: 16

約数和(自身を含む): 29654784

約数和(自身を除く): 8933279

約数列:

[1, 5, 7, 23, 35, 115, 161, 805, 25741, 128705, 180187, 592043, 900935, 2960215, 4144301, 20721505]

約数ペア:

[(1, 20721505), (5, 4144301), (7, 2960215), (23, 900935), (35, 592043), (115, 180187), (161, 128705), (805, 25741)]