1620405

素因数分解:

$3^4\times 5^1\times {\mathrm{4001}}^1$

素因数の和:4018

約数の個数: 20

約数和(自身を含む): 2905452

約数和(自身を除く): 1285047

約数列:

[1, 3, 5, 9, 15, 27, 45, 81, 135, 405, 4001, 12003, 20005, 36009, 60015, 108027, 180045, 324081, 540135, 1620405]

約数ペア:

[(1, 1620405), (3, 540135), (5, 324081), (9, 180045), (15, 108027), (27, 60015), (45, 36009), (81, 20005), (135, 12003), (405, 4001)]