21203975

素因数分解:

$5^2\times {\mathrm{13}}^1\times {\mathrm{53}}^1\times {\mathrm{1231}}^1$

素因数の和:1307

約数の個数: 24

約数和(自身を含む): 28873152

約数和(自身を除く): 7669177

約数列:

[1, 5, 13, 25, 53, 65, 265, 325, 689, 1231, 1325, 3445, 6155, 16003, 17225, 30775, 65243, 80015, 326215, 400075, 848159, 1631075, 4240795, 21203975]

約数ペア:

[(1, 21203975), (5, 4240795), (13, 1631075), (25, 848159), (53, 400075), (65, 326215), (265, 80015), (325, 65243), (689, 30775), (1231, 17225), (1325, 16003), (3445, 6155)]