19911780

素因数分解:

$2^2\times 3^2\times 5^1\times 7^1\times {\mathrm{15803}}^1$

素因数の和:15825

約数の個数: 72

約数和(自身を含む): 69031872

約数和(自身を除く): 49120092

約数列:

[1, 2, 3, 4, 5, 6, 7, 9, 10, 12, 14, 15, 18, 20, 21, 28, 30, 35, 36, 42, 45, 60, 63, 70, 84, 90, 105, 126, 140, 180, 210, 252, 315, 420, 630, 1260, 15803, 31606, 47409, 63212, 79015, 94818, 110621, 142227, 158030, 189636, 221242, 237045, 284454, 316060, 331863, 442484, 474090, 553105, 568908, 663726, 711135, 948180, 995589, 1106210, 1327452, 1422270, 1659315, 1991178, 2212420, 2844540, 3318630, 3982356, 4977945, 6637260, 9955890, 19911780]

約数ペア:

[(1, 19911780), (2, 9955890), (3, 6637260), (4, 4977945), (5, 3982356), (6, 3318630), (7, 2844540), (9, 2212420), (10, 1991178), (12, 1659315), (14, 1422270), (15, 1327452), (18, 1106210), (20, 995589), (21, 948180), (28, 711135), (30, 663726), (35, 568908), (36, 553105), (42, 474090), (45, 442484), (60, 331863), (63, 316060), (70, 284454), (84, 237045), (90, 221242), (105, 189636), (126, 158030), (140, 142227), (180, 110621), (210, 94818), (252, 79015), (315, 63212), (420, 47409), (630, 31606), (1260, 15803)]