21781863

素因数分解:

$3^2\times {\mathrm{37}}^1\times {\mathrm{149}}^1\times {\mathrm{439}}^1$

素因数の和:631

約数の個数: 24

約数和(自身を含む): 32604000

約数和(自身を除く): 10822137

約数列:

[1, 3, 9, 37, 111, 149, 333, 439, 447, 1317, 1341, 3951, 5513, 16243, 16539, 48729, 49617, 65411, 146187, 196233, 588699, 2420207, 7260621, 21781863]

約数ペア:

[(1, 21781863), (3, 7260621), (9, 2420207), (37, 588699), (111, 196233), (149, 146187), (333, 65411), (439, 49617), (447, 48729), (1317, 16539), (1341, 16243), (3951, 5513)]