21007215

素因数分解:

$3^3\times 5^1\times {\mathrm{155609}}^1$

素因数の和:155623

約数の個数: 16

約数和(自身を含む): 37346400

約数和(自身を除く): 16339185

約数列:

[1, 3, 5, 9, 15, 27, 45, 135, 155609, 466827, 778045, 1400481, 2334135, 4201443, 7002405, 21007215]

約数ペア:

[(1, 21007215), (3, 7002405), (5, 4201443), (9, 2334135), (15, 1400481), (27, 778045), (45, 466827), (135, 155609)]