21747775

素因数分解:

$5^2\times 7^1\times {\mathrm{151}}^1\times {\mathrm{823}}^1$

素因数の和:991

約数の個数: 24

約数和(自身を含む): 31061504

約数和(自身を除く): 9313729

約数列:

[1, 5, 7, 25, 35, 151, 175, 755, 823, 1057, 3775, 4115, 5285, 5761, 20575, 26425, 28805, 124273, 144025, 621365, 869911, 3106825, 4349555, 21747775]

約数ペア:

[(1, 21747775), (5, 4349555), (7, 3106825), (25, 869911), (35, 621365), (151, 144025), (175, 124273), (755, 28805), (823, 26425), (1057, 20575), (3775, 5761), (4115, 5285)]