19911996

素因数分解:

$2^2\times 3^2\times {\mathrm{13}}^1\times {\mathrm{157}}^1\times {\mathrm{271}}^1$

素因数の和:451

約数の個数: 72

約数和(自身を含む): 54751424

約数和(自身を除く): 34839428

約数列:

[1, 2, 3, 4, 6, 9, 12, 13, 18, 26, 36, 39, 52, 78, 117, 156, 157, 234, 271, 314, 468, 471, 542, 628, 813, 942, 1084, 1413, 1626, 1884, 2041, 2439, 2826, 3252, 3523, 4082, 4878, 5652, 6123, 7046, 8164, 9756, 10569, 12246, 14092, 18369, 21138, 24492, 31707, 36738, 42276, 42547, 63414, 73476, 85094, 126828, 127641, 170188, 255282, 382923, 510564, 553111, 765846, 1106222, 1531692, 1659333, 2212444, 3318666, 4977999, 6637332, 9955998, 19911996]

約数ペア:

[(1, 19911996), (2, 9955998), (3, 6637332), (4, 4977999), (6, 3318666), (9, 2212444), (12, 1659333), (13, 1531692), (18, 1106222), (26, 765846), (36, 553111), (39, 510564), (52, 382923), (78, 255282), (117, 170188), (156, 127641), (157, 126828), (234, 85094), (271, 73476), (314, 63414), (468, 42547), (471, 42276), (542, 36738), (628, 31707), (813, 24492), (942, 21138), (1084, 18369), (1413, 14092), (1626, 12246), (1884, 10569), (2041, 9756), (2439, 8164), (2826, 7046), (3252, 6123), (3523, 5652), (4082, 4878)]