21538455

素因数分解:

$3^1\times 5^1\times {\mathrm{47}}^1\times {\mathrm{137}}^1\times {\mathrm{223}}^1$

素因数の和:415

約数の個数: 32

約数和(自身を含む): 35610624

約数和(自身を除く): 14072169

約数列:

[1, 3, 5, 15, 47, 137, 141, 223, 235, 411, 669, 685, 705, 1115, 2055, 3345, 6439, 10481, 19317, 30551, 31443, 32195, 52405, 91653, 96585, 152755, 157215, 458265, 1435897, 4307691, 7179485, 21538455]

約数ペア:

[(1, 21538455), (3, 7179485), (5, 4307691), (15, 1435897), (47, 458265), (137, 157215), (141, 152755), (223, 96585), (235, 91653), (411, 52405), (669, 32195), (685, 31443), (705, 30551), (1115, 19317), (2055, 10481), (3345, 6439)]