20990475

素因数分解:

$3^3\times 5^2\times {\mathrm{11}}^2\times {\mathrm{257}}^1$

素因数の和:298

約数の個数: 72

約数和(自身を含む): 42549360

約数和(自身を除く): 21558885

約数列:

[1, 3, 5, 9, 11, 15, 25, 27, 33, 45, 55, 75, 99, 121, 135, 165, 225, 257, 275, 297, 363, 495, 605, 675, 771, 825, 1089, 1285, 1485, 1815, 2313, 2475, 2827, 3025, 3267, 3855, 5445, 6425, 6939, 7425, 8481, 9075, 11565, 14135, 16335, 19275, 25443, 27225, 31097, 34695, 42405, 57825, 70675, 76329, 81675, 93291, 127215, 155485, 173475, 212025, 279873, 381645, 466455, 636075, 777425, 839619, 1399365, 1908225, 2332275, 4198095, 6996825, 20990475]

約数ペア:

[(1, 20990475), (3, 6996825), (5, 4198095), (9, 2332275), (11, 1908225), (15, 1399365), (25, 839619), (27, 777425), (33, 636075), (45, 466455), (55, 381645), (75, 279873), (99, 212025), (121, 173475), (135, 155485), (165, 127215), (225, 93291), (257, 81675), (275, 76329), (297, 70675), (363, 57825), (495, 42405), (605, 34695), (675, 31097), (771, 27225), (825, 25443), (1089, 19275), (1285, 16335), (1485, 14135), (1815, 11565), (2313, 9075), (2475, 8481), (2827, 7425), (3025, 6939), (3267, 6425), (3855, 5445)]