21012825

素因数分解:

$3^1\times 5^2\times {\mathrm{503}}^1\times {\mathrm{557}}^1$

素因数の和:1073

約数の個数: 24

約数和(自身を含む): 34872768

約数和(自身を除く): 13859943

約数列:

[1, 3, 5, 15, 25, 75, 503, 557, 1509, 1671, 2515, 2785, 7545, 8355, 12575, 13925, 37725, 41775, 280171, 840513, 1400855, 4202565, 7004275, 21012825]

約数ペア:

[(1, 21012825), (3, 7004275), (5, 4202565), (15, 1400855), (25, 840513), (75, 280171), (503, 41775), (557, 37725), (1509, 13925), (1671, 12575), (2515, 8355), (2785, 7545)]