28007725

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{71}}^1\times {\mathrm{509}}^1$

素因数の和:621

約数の個数: 24

約数和(自身を含む): 36426240

約数和(自身を除く): 8418515

約数列:

[1, 5, 25, 31, 71, 155, 355, 509, 775, 1775, 2201, 2545, 11005, 12725, 15779, 36139, 55025, 78895, 180695, 394475, 903475, 1120309, 5601545, 28007725]

約数ペア:

[(1, 28007725), (5, 5601545), (25, 1120309), (31, 903475), (71, 394475), (155, 180695), (355, 78895), (509, 55025), (775, 36139), (1775, 15779), (2201, 12725), (2545, 11005)]