21139425

素因数分解:

$3^2\times 5^2\times {\mathrm{47}}^1\times {\mathrm{1999}}^1$

素因数の和:2062

約数の個数: 36

約数和(自身を含む): 38688000

約数和(自身を除く): 17548575

約数列:

[1, 3, 5, 9, 15, 25, 45, 47, 75, 141, 225, 235, 423, 705, 1175, 1999, 2115, 3525, 5997, 9995, 10575, 17991, 29985, 49975, 89955, 93953, 149925, 281859, 449775, 469765, 845577, 1409295, 2348825, 4227885, 7046475, 21139425]

約数ペア:

[(1, 21139425), (3, 7046475), (5, 4227885), (9, 2348825), (15, 1409295), (25, 845577), (45, 469765), (47, 449775), (75, 281859), (141, 149925), (225, 93953), (235, 89955), (423, 49975), (705, 29985), (1175, 17991), (1999, 10575), (2115, 9995), (3525, 5997)]