21011775

素因数分解:

$3^1\times 5^2\times {\mathrm{281}}^1\times {\mathrm{997}}^1$

素因数の和:1291

約数の個数: 24

約数和(自身を含む): 34898064

約数和(自身を除く): 13886289

約数列:

[1, 3, 5, 15, 25, 75, 281, 843, 997, 1405, 2991, 4215, 4985, 7025, 14955, 21075, 24925, 74775, 280157, 840471, 1400785, 4202355, 7003925, 21011775]

約数ペア:

[(1, 21011775), (3, 7003925), (5, 4202355), (15, 1400785), (25, 840471), (75, 280157), (281, 74775), (843, 24925), (997, 21075), (1405, 14955), (2991, 7025), (4215, 4985)]