20986749

素因数分解:

$3^3\times 7^2\times {\mathrm{29}}^1\times {\mathrm{547}}^1$

素因数の和:599

約数の個数: 48

約数和(自身を含む): 37483200

約数和(自身を除く): 16496451

約数列:

[1, 3, 7, 9, 21, 27, 29, 49, 63, 87, 147, 189, 203, 261, 441, 547, 609, 783, 1323, 1421, 1641, 1827, 3829, 4263, 4923, 5481, 11487, 12789, 14769, 15863, 26803, 34461, 38367, 47589, 80409, 103383, 111041, 142767, 241227, 333123, 428301, 723681, 777287, 999369, 2331861, 2998107, 6995583, 20986749]

約数ペア:

[(1, 20986749), (3, 6995583), (7, 2998107), (9, 2331861), (21, 999369), (27, 777287), (29, 723681), (49, 428301), (63, 333123), (87, 241227), (147, 142767), (189, 111041), (203, 103383), (261, 80409), (441, 47589), (547, 38367), (609, 34461), (783, 26803), (1323, 15863), (1421, 14769), (1641, 12789), (1827, 11487), (3829, 5481), (4263, 4923)]