15911721

素因数分解:

$3^4\times 7^2\times {\mathrm{19}}^1\times {\mathrm{211}}^1$

素因数の和:256

約数の個数: 60

約数和(自身を含む): 29243280

約数和(自身を除く): 13331559

約数列:

[1, 3, 7, 9, 19, 21, 27, 49, 57, 63, 81, 133, 147, 171, 189, 211, 399, 441, 513, 567, 633, 931, 1197, 1323, 1477, 1539, 1899, 2793, 3591, 3969, 4009, 4431, 5697, 8379, 10339, 10773, 12027, 13293, 17091, 25137, 28063, 31017, 36081, 39879, 75411, 84189, 93051, 108243, 119637, 196441, 252567, 279153, 324729, 589323, 757701, 837459, 1767969, 2273103, 5303907, 15911721]

約数ペア:

[(1, 15911721), (3, 5303907), (7, 2273103), (9, 1767969), (19, 837459), (21, 757701), (27, 589323), (49, 324729), (57, 279153), (63, 252567), (81, 196441), (133, 119637), (147, 108243), (171, 93051), (189, 84189), (211, 75411), (399, 39879), (441, 36081), (513, 31017), (567, 28063), (633, 25137), (931, 17091), (1197, 13293), (1323, 12027), (1477, 10773), (1539, 10339), (1899, 8379), (2793, 5697), (3591, 4431), (3969, 4009)]