20641075

素因数分解:

$5^2\times 7^1\times {\mathrm{13}}^1\times {\mathrm{43}}^1\times {\mathrm{211}}^1$

素因数の和:284

約数の個数: 48

約数和(自身を含む): 32386816

約数和(自身を除く): 11745741

約数列:

[1, 5, 7, 13, 25, 35, 43, 65, 91, 175, 211, 215, 301, 325, 455, 559, 1055, 1075, 1477, 1505, 2275, 2743, 2795, 3913, 5275, 7385, 7525, 9073, 13715, 13975, 19201, 19565, 36925, 45365, 63511, 68575, 96005, 97825, 117949, 226825, 317555, 480025, 589745, 825643, 1587775, 2948725, 4128215, 20641075]

約数ペア:

[(1, 20641075), (5, 4128215), (7, 2948725), (13, 1587775), (25, 825643), (35, 589745), (43, 480025), (65, 317555), (91, 226825), (175, 117949), (211, 97825), (215, 96005), (301, 68575), (325, 63511), (455, 45365), (559, 36925), (1055, 19565), (1075, 19201), (1477, 13975), (1505, 13715), (2275, 9073), (2743, 7525), (2795, 7385), (3913, 5275)]