21780280

素因数分解:

$2^3\times 5^1\times {\mathrm{73}}^1\times {\mathrm{7459}}^1$

素因数の和:7543

約数の個数: 32

約数和(自身を含む): 49683600

約数和(自身を除く): 27903320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 73, 146, 292, 365, 584, 730, 1460, 2920, 7459, 14918, 29836, 37295, 59672, 74590, 149180, 298360, 544507, 1089014, 2178028, 2722535, 4356056, 5445070, 10890140, 21780280]

約数ペア:

[(1, 21780280), (2, 10890140), (4, 5445070), (5, 4356056), (8, 2722535), (10, 2178028), (20, 1089014), (40, 544507), (73, 298360), (146, 149180), (292, 74590), (365, 59672), (584, 37295), (730, 29836), (1460, 14918), (2920, 7459)]