20686815

素因数分解:

$3^2\times 5^1\times {\mathrm{47}}^1\times {\mathrm{9781}}^1$

素因数の和:9839

約数の個数: 24

約数和(自身を含む): 36623808

約数和(自身を除く): 15936993

約数列:

[1, 3, 5, 9, 15, 45, 47, 141, 235, 423, 705, 2115, 9781, 29343, 48905, 88029, 146715, 440145, 459707, 1379121, 2298535, 4137363, 6895605, 20686815]

約数ペア:

[(1, 20686815), (3, 6895605), (5, 4137363), (9, 2298535), (15, 1379121), (45, 459707), (47, 440145), (141, 146715), (235, 88029), (423, 48905), (705, 29343), (2115, 9781)]