21509145

素因数分解:

$3^7\times 5^1\times 7^1\times {\mathrm{281}}^1$

素因数の和:314

約数の個数: 64

約数和(自身を含む): 44398080

約数和(自身を除く): 22888935

約数列:

[1, 3, 5, 7, 9, 15, 21, 27, 35, 45, 63, 81, 105, 135, 189, 243, 281, 315, 405, 567, 729, 843, 945, 1215, 1405, 1701, 1967, 2187, 2529, 2835, 3645, 4215, 5103, 5901, 7587, 8505, 9835, 10935, 12645, 15309, 17703, 22761, 25515, 29505, 37935, 53109, 68283, 76545, 88515, 113805, 159327, 204849, 265545, 341415, 477981, 614547, 796635, 1024245, 1433943, 2389905, 3072735, 4301829, 7169715, 21509145]

約数ペア:

[(1, 21509145), (3, 7169715), (5, 4301829), (7, 3072735), (9, 2389905), (15, 1433943), (21, 1024245), (27, 796635), (35, 614547), (45, 477981), (63, 341415), (81, 265545), (105, 204849), (135, 159327), (189, 113805), (243, 88515), (281, 76545), (315, 68283), (405, 53109), (567, 37935), (729, 29505), (843, 25515), (945, 22761), (1215, 17703), (1405, 15309), (1701, 12645), (1967, 10935), (2187, 9835), (2529, 8505), (2835, 7587), (3645, 5901), (4215, 5103)]