21660615

素因数分解:

$3^4\times 5^1\times {\mathrm{79}}^1\times {\mathrm{677}}^1$

素因数の和:773

約数の個数: 40

約数和(自身を含む): 39378240

約数和(自身を除く): 17717625

約数列:

[1, 3, 5, 9, 15, 27, 45, 79, 81, 135, 237, 395, 405, 677, 711, 1185, 2031, 2133, 3385, 3555, 6093, 6399, 10155, 10665, 18279, 30465, 31995, 53483, 54837, 91395, 160449, 267415, 274185, 481347, 802245, 1444041, 2406735, 4332123, 7220205, 21660615]

約数ペア:

[(1, 21660615), (3, 7220205), (5, 4332123), (9, 2406735), (15, 1444041), (27, 802245), (45, 481347), (79, 274185), (81, 267415), (135, 160449), (237, 91395), (395, 54837), (405, 53483), (677, 31995), (711, 30465), (1185, 18279), (2031, 10665), (2133, 10155), (3385, 6399), (3555, 6093)]