21018555

素因数分解:

$3^3\times 5^1\times {\mathrm{155693}}^1$

素因数の和:155707

約数の個数: 16

約数和(自身を含む): 37366560

約数和(自身を除く): 16348005

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 155693, 467079, 778465, 1401237, 2335395, 4203711, 7006185, 21018555]

約数ペア:

[(1, 21018555), (3, 7006185), (5, 4203711), (9, 2335395), (15, 1401237), (27, 778465), (45, 467079), (135, 155693)]