19985420

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{13}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:247

約数の個数: 96

約数和(自身を含む): 52684800

約数和(自身を除く): 32699380

約数列:

[1, 2, 4, 5, 7, 10, 13, 14, 20, 26, 28, 35, 52, 65, 70, 79, 91, 130, 139, 140, 158, 182, 260, 278, 316, 364, 395, 455, 553, 556, 695, 790, 910, 973, 1027, 1106, 1390, 1580, 1807, 1820, 1946, 2054, 2212, 2765, 2780, 3614, 3892, 4108, 4865, 5135, 5530, 7189, 7228, 9035, 9730, 10270, 10981, 11060, 12649, 14378, 18070, 19460, 20540, 21962, 25298, 28756, 35945, 36140, 43924, 50596, 54905, 63245, 71890, 76867, 109810, 126490, 142753, 143780, 153734, 219620, 252980, 285506, 307468, 384335, 571012, 713765, 768670, 999271, 1427530, 1537340, 1998542, 2855060, 3997084, 4996355, 9992710, 19985420]

約数ペア:

[(1, 19985420), (2, 9992710), (4, 4996355), (5, 3997084), (7, 2855060), (10, 1998542), (13, 1537340), (14, 1427530), (20, 999271), (26, 768670), (28, 713765), (35, 571012), (52, 384335), (65, 307468), (70, 285506), (79, 252980), (91, 219620), (130, 153734), (139, 143780), (140, 142753), (158, 126490), (182, 109810), (260, 76867), (278, 71890), (316, 63245), (364, 54905), (395, 50596), (455, 43924), (553, 36140), (556, 35945), (695, 28756), (790, 25298), (910, 21962), (973, 20540), (1027, 19460), (1106, 18070), (1390, 14378), (1580, 12649), (1807, 11060), (1820, 10981), (1946, 10270), (2054, 9730), (2212, 9035), (2765, 7228), (2780, 7189), (3614, 5530), (3892, 5135), (4108, 4865)]