18979775

素因数分解:

$5^2\times {\mathrm{29}}^1\times {\mathrm{47}}^1\times {\mathrm{557}}^1$

素因数の和:643

約数の個数: 24

約数和(自身を含む): 24909120

約数和(自身を除く): 5929345

約数列:

[1, 5, 25, 29, 47, 145, 235, 557, 725, 1175, 1363, 2785, 6815, 13925, 16153, 26179, 34075, 80765, 130895, 403825, 654475, 759191, 3795955, 18979775]

約数ペア:

[(1, 18979775), (5, 3795955), (25, 759191), (29, 654475), (47, 403825), (145, 130895), (235, 80765), (557, 34075), (725, 26179), (1175, 16153), (1363, 13925), (2785, 6815)]