21280012

素因数分解:

$2^2\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{43}}^1\times {\mathrm{307}}^1$

素因数の和:398

約数の個数: 48

約数和(自身を含む): 42499072

約数和(自身を除く): 21219060

約数列:

[1, 2, 4, 13, 26, 31, 43, 52, 62, 86, 124, 172, 307, 403, 559, 614, 806, 1118, 1228, 1333, 1612, 2236, 2666, 3991, 5332, 7982, 9517, 13201, 15964, 17329, 19034, 26402, 34658, 38068, 52804, 69316, 123721, 171613, 247442, 343226, 409231, 494884, 686452, 818462, 1636924, 5320003, 10640006, 21280012]

約数ペア:

[(1, 21280012), (2, 10640006), (4, 5320003), (13, 1636924), (26, 818462), (31, 686452), (43, 494884), (52, 409231), (62, 343226), (86, 247442), (124, 171613), (172, 123721), (307, 69316), (403, 52804), (559, 38068), (614, 34658), (806, 26402), (1118, 19034), (1228, 17329), (1333, 15964), (1612, 13201), (2236, 9517), (2666, 7982), (3991, 5332)]