21721329

素因数分解:

$3^2\times 7^1\times {\mathrm{557}}^1\times {\mathrm{619}}^1$

素因数の和:1189

約数の個数: 24

約数和(自身を含む): 35979840

約数和(自身を除く): 14258511

約数列:

[1, 3, 7, 9, 21, 63, 557, 619, 1671, 1857, 3899, 4333, 5013, 5571, 11697, 12999, 35091, 38997, 344783, 1034349, 2413481, 3103047, 7240443, 21721329]

約数ペア:

[(1, 21721329), (3, 7240443), (7, 3103047), (9, 2413481), (21, 1034349), (63, 344783), (557, 38997), (619, 35091), (1671, 12999), (1857, 11697), (3899, 5571), (4333, 5013)]