20688615

素因数分解:

$3^4\times 5^1\times {\mathrm{23}}^1\times {\mathrm{2221}}^1$

素因数の和:2261

約数の個数: 40

約数和(自身を含む): 38716128

約数和(自身を除く): 18027513

約数列:

[1, 3, 5, 9, 15, 23, 27, 45, 69, 81, 115, 135, 207, 345, 405, 621, 1035, 1863, 2221, 3105, 6663, 9315, 11105, 19989, 33315, 51083, 59967, 99945, 153249, 179901, 255415, 299835, 459747, 766245, 899505, 1379241, 2298735, 4137723, 6896205, 20688615]

約数ペア:

[(1, 20688615), (3, 6896205), (5, 4137723), (9, 2298735), (15, 1379241), (23, 899505), (27, 766245), (45, 459747), (69, 299835), (81, 255415), (115, 179901), (135, 153249), (207, 99945), (345, 59967), (405, 51083), (621, 33315), (1035, 19989), (1863, 11105), (2221, 9315), (3105, 6663)]