21190491

素因数分解:

$3^4\times 7^2\times {\mathrm{19}}^1\times {\mathrm{281}}^1$

素因数の和:326

約数の個数: 60

約数和(自身を含む): 38899080

約数和(自身を除く): 17708589

約数列:

[1, 3, 7, 9, 19, 21, 27, 49, 57, 63, 81, 133, 147, 171, 189, 281, 399, 441, 513, 567, 843, 931, 1197, 1323, 1539, 1967, 2529, 2793, 3591, 3969, 5339, 5901, 7587, 8379, 10773, 13769, 16017, 17703, 22761, 25137, 37373, 41307, 48051, 53109, 75411, 112119, 123921, 144153, 159327, 261611, 336357, 371763, 432459, 784833, 1009071, 1115289, 2354499, 3027213, 7063497, 21190491]

約数ペア:

[(1, 21190491), (3, 7063497), (7, 3027213), (9, 2354499), (19, 1115289), (21, 1009071), (27, 784833), (49, 432459), (57, 371763), (63, 336357), (81, 261611), (133, 159327), (147, 144153), (171, 123921), (189, 112119), (281, 75411), (399, 53109), (441, 48051), (513, 41307), (567, 37373), (843, 25137), (931, 22761), (1197, 17703), (1323, 16017), (1539, 13769), (1967, 10773), (2529, 8379), (2793, 7587), (3591, 5901), (3969, 5339)]