21028815

素因数分解:

$3^4\times 5^1\times {\mathrm{137}}^1\times {\mathrm{379}}^1$

素因数の和:533

約数の個数: 40

約数和(自身を含む): 38071440

約数和(自身を除く): 17042625

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 137, 379, 405, 411, 685, 1137, 1233, 1895, 2055, 3411, 3699, 5685, 6165, 10233, 11097, 17055, 18495, 30699, 51165, 51923, 55485, 153495, 155769, 259615, 467307, 778845, 1401921, 2336535, 4205763, 7009605, 21028815]

約数ペア:

[(1, 21028815), (3, 7009605), (5, 4205763), (9, 2336535), (15, 1401921), (27, 778845), (45, 467307), (81, 259615), (135, 155769), (137, 153495), (379, 55485), (405, 51923), (411, 51165), (685, 30699), (1137, 18495), (1233, 17055), (1895, 11097), (2055, 10233), (3411, 6165), (3699, 5685)]