20879775

素因数分解:

$3^5\times 5^2\times 7^1\times {\mathrm{491}}^1$

素因数の和:523

約数の個数: 72

約数和(自身を含む): 44413824

約数和(自身を除く): 23534049

約数列:

[1, 3, 5, 7, 9, 15, 21, 25, 27, 35, 45, 63, 75, 81, 105, 135, 175, 189, 225, 243, 315, 405, 491, 525, 567, 675, 945, 1215, 1473, 1575, 1701, 2025, 2455, 2835, 3437, 4419, 4725, 6075, 7365, 8505, 10311, 12275, 13257, 14175, 17185, 22095, 30933, 36825, 39771, 42525, 51555, 66285, 85925, 92799, 110475, 119313, 154665, 198855, 257775, 278397, 331425, 463995, 596565, 773325, 835191, 994275, 1391985, 2319975, 2982825, 4175955, 6959925, 20879775]

約数ペア:

[(1, 20879775), (3, 6959925), (5, 4175955), (7, 2982825), (9, 2319975), (15, 1391985), (21, 994275), (25, 835191), (27, 773325), (35, 596565), (45, 463995), (63, 331425), (75, 278397), (81, 257775), (105, 198855), (135, 154665), (175, 119313), (189, 110475), (225, 92799), (243, 85925), (315, 66285), (405, 51555), (491, 42525), (525, 39771), (567, 36825), (675, 30933), (945, 22095), (1215, 17185), (1473, 14175), (1575, 13257), (1701, 12275), (2025, 10311), (2455, 8505), (2835, 7365), (3437, 6075), (4419, 4725)]