21204375

素因数分解:

$3^1\times 5^4\times {\mathrm{43}}^1\times {\mathrm{263}}^1$

素因数の和:329

約数の個数: 40

約数和(自身を含む): 36288384

約数和(自身を除く): 15084009

約数列:

[1, 3, 5, 15, 25, 43, 75, 125, 129, 215, 263, 375, 625, 645, 789, 1075, 1315, 1875, 3225, 3945, 5375, 6575, 11309, 16125, 19725, 26875, 32875, 33927, 56545, 80625, 98625, 164375, 169635, 282725, 493125, 848175, 1413625, 4240875, 7068125, 21204375]

約数ペア:

[(1, 21204375), (3, 7068125), (5, 4240875), (15, 1413625), (25, 848175), (43, 493125), (75, 282725), (125, 169635), (129, 164375), (215, 98625), (263, 80625), (375, 56545), (625, 33927), (645, 32875), (789, 26875), (1075, 19725), (1315, 16125), (1875, 11309), (3225, 6575), (3945, 5375)]