20999655

素因数分解:

$3^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{2729}}^1$

素因数の和:2765

約数の個数: 40

約数和(自身を含む): 39639600

約数和(自身を除く): 18639945

約数列:

[1, 3, 5, 9, 15, 19, 27, 45, 57, 81, 95, 135, 171, 285, 405, 513, 855, 1539, 2565, 2729, 7695, 8187, 13645, 24561, 40935, 51851, 73683, 122805, 155553, 221049, 259255, 368415, 466659, 777765, 1105245, 1399977, 2333295, 4199931, 6999885, 20999655]

約数ペア:

[(1, 20999655), (3, 6999885), (5, 4199931), (9, 2333295), (15, 1399977), (19, 1105245), (27, 777765), (45, 466659), (57, 368415), (81, 259255), (95, 221049), (135, 155553), (171, 122805), (285, 73683), (405, 51851), (513, 40935), (855, 24561), (1539, 13645), (2565, 8187), (2729, 7695)]