21003975

素因数分解:

$3^3\times 5^2\times {\mathrm{29}}^2\times {\mathrm{37}}^1$

素因数の和:114

約数の個数: 72

約数和(自身を含む): 41041520

約数和(自身を除く): 20037545

約数列:

[1, 3, 5, 9, 15, 25, 27, 29, 37, 45, 75, 87, 111, 135, 145, 185, 225, 261, 333, 435, 555, 675, 725, 783, 841, 925, 999, 1073, 1305, 1665, 2175, 2523, 2775, 3219, 3915, 4205, 4995, 5365, 6525, 7569, 8325, 9657, 12615, 16095, 19575, 21025, 22707, 24975, 26825, 28971, 31117, 37845, 48285, 63075, 80475, 93351, 113535, 144855, 155585, 189225, 241425, 280053, 466755, 567675, 724275, 777925, 840159, 1400265, 2333775, 4200795, 7001325, 21003975]

約数ペア:

[(1, 21003975), (3, 7001325), (5, 4200795), (9, 2333775), (15, 1400265), (25, 840159), (27, 777925), (29, 724275), (37, 567675), (45, 466755), (75, 280053), (87, 241425), (111, 189225), (135, 155585), (145, 144855), (185, 113535), (225, 93351), (261, 80475), (333, 63075), (435, 48285), (555, 37845), (675, 31117), (725, 28971), (783, 26825), (841, 24975), (925, 22707), (999, 21025), (1073, 19575), (1305, 16095), (1665, 12615), (2175, 9657), (2523, 8325), (2775, 7569), (3219, 6525), (3915, 5365), (4205, 4995)]