20801205

素因数分解:

$3^4\times 5^1\times {\mathrm{51361}}^1$

素因数の和:51378

約数の個数: 20

約数和(自身を含む): 37288812

約数和(自身を除く): 16487607

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 51361, 154083, 256805, 462249, 770415, 1386747, 2311245, 4160241, 6933735, 20801205]

約数ペア:

[(1, 20801205), (3, 6933735), (5, 4160241), (9, 2311245), (15, 1386747), (27, 770415), (45, 462249), (81, 256805), (135, 154083), (405, 51361)]