19747775

素因数分解:

$5^2\times {\mathrm{31}}^1\times {\mathrm{83}}^1\times {\mathrm{307}}^1$

素因数の和:431

約数の個数: 24

約数和(自身を含む): 25665024

約数和(自身を除く): 5917249

約数列:

[1, 5, 25, 31, 83, 155, 307, 415, 775, 1535, 2075, 2573, 7675, 9517, 12865, 25481, 47585, 64325, 127405, 237925, 637025, 789911, 3949555, 19747775]

約数ペア:

[(1, 19747775), (5, 3949555), (25, 789911), (31, 637025), (83, 237925), (155, 127405), (307, 64325), (415, 47585), (775, 25481), (1535, 12865), (2075, 9517), (2573, 7675)]