18991215

素因数分解:

$3^2\times 5^1\times {\mathrm{23}}^1\times {\mathrm{59}}^1\times {\mathrm{311}}^1$

素因数の和:404

約数の個数: 48

約数和(自身を含む): 35043840

約数和(自身を除く): 16052625

約数列:

[1, 3, 5, 9, 15, 23, 45, 59, 69, 115, 177, 207, 295, 311, 345, 531, 885, 933, 1035, 1357, 1555, 2655, 2799, 4071, 4665, 6785, 7153, 12213, 13995, 18349, 20355, 21459, 35765, 55047, 61065, 64377, 91745, 107295, 165141, 275235, 321885, 422027, 825705, 1266081, 2110135, 3798243, 6330405, 18991215]

約数ペア:

[(1, 18991215), (3, 6330405), (5, 3798243), (9, 2110135), (15, 1266081), (23, 825705), (45, 422027), (59, 321885), (69, 275235), (115, 165141), (177, 107295), (207, 91745), (295, 64377), (311, 61065), (345, 55047), (531, 35765), (885, 21459), (933, 20355), (1035, 18349), (1357, 13995), (1555, 12213), (2655, 7153), (2799, 6785), (4071, 4665)]