20991000

素因数分解:

$2^3\times 3^1\times 5^3\times {\mathrm{6997}}^1$

素因数の和:7021

約数の個数: 64

約数和(自身を含む): 65501280

約数和(自身を除く): 44510280

約数列:

[1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 25, 30, 40, 50, 60, 75, 100, 120, 125, 150, 200, 250, 300, 375, 500, 600, 750, 1000, 1500, 3000, 6997, 13994, 20991, 27988, 34985, 41982, 55976, 69970, 83964, 104955, 139940, 167928, 174925, 209910, 279880, 349850, 419820, 524775, 699700, 839640, 874625, 1049550, 1399400, 1749250, 2099100, 2623875, 3498500, 4198200, 5247750, 6997000, 10495500, 20991000]

約数ペア:

[(1, 20991000), (2, 10495500), (3, 6997000), (4, 5247750), (5, 4198200), (6, 3498500), (8, 2623875), (10, 2099100), (12, 1749250), (15, 1399400), (20, 1049550), (24, 874625), (25, 839640), (30, 699700), (40, 524775), (50, 419820), (60, 349850), (75, 279880), (100, 209910), (120, 174925), (125, 167928), (150, 139940), (200, 104955), (250, 83964), (300, 69970), (375, 55976), (500, 41982), (600, 34985), (750, 27988), (1000, 20991), (1500, 13994), (3000, 6997)]