21028005

素因数分解:

$3^8\times 5^1\times {\mathrm{641}}^1$

素因数の和:670

約数の個数: 36

約数和(自身を含む): 37907532

約数和(自身を除く): 16879527

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 641, 729, 1215, 1923, 2187, 3205, 3645, 5769, 6561, 9615, 10935, 17307, 28845, 32805, 51921, 86535, 155763, 259605, 467289, 778815, 1401867, 2336445, 4205601, 7009335, 21028005]

約数ペア:

[(1, 21028005), (3, 7009335), (5, 4205601), (9, 2336445), (15, 1401867), (27, 778815), (45, 467289), (81, 259605), (135, 155763), (243, 86535), (405, 51921), (641, 32805), (729, 28845), (1215, 17307), (1923, 10935), (2187, 9615), (3205, 6561), (3645, 5769)]