21354575

素因数分解:

$5^2\times {\mathrm{11}}^1\times {\mathrm{19}}^1\times {\mathrm{61}}^1\times {\mathrm{67}}^1$

素因数の和:168

約数の個数: 48

約数和(自身を含む): 31367040

約数和(自身を除く): 10012465

約数列:

[1, 5, 11, 19, 25, 55, 61, 67, 95, 209, 275, 305, 335, 475, 671, 737, 1045, 1159, 1273, 1525, 1675, 3355, 3685, 4087, 5225, 5795, 6365, 12749, 14003, 16775, 18425, 20435, 28975, 31825, 44957, 63745, 70015, 77653, 102175, 224785, 318725, 350075, 388265, 854183, 1123925, 1941325, 4270915, 21354575]

約数ペア:

[(1, 21354575), (5, 4270915), (11, 1941325), (19, 1123925), (25, 854183), (55, 388265), (61, 350075), (67, 318725), (95, 224785), (209, 102175), (275, 77653), (305, 70015), (335, 63745), (475, 44957), (671, 31825), (737, 28975), (1045, 20435), (1159, 18425), (1273, 16775), (1525, 14003), (1675, 12749), (3355, 6365), (3685, 5795), (4087, 5225)]