21749679

素因数分解:

$3^2\times 7^2\times {\mathrm{149}}^1\times {\mathrm{331}}^1$

素因数の和:500

約数の個数: 36

約数和(自身を含む): 36901800

約数和(自身を除く): 15152121

約数列:

[1, 3, 7, 9, 21, 49, 63, 147, 149, 331, 441, 447, 993, 1043, 1341, 2317, 2979, 3129, 6951, 7301, 9387, 16219, 20853, 21903, 48657, 49319, 65709, 145971, 147957, 345233, 443871, 1035699, 2416631, 3107097, 7249893, 21749679]

約数ペア:

[(1, 21749679), (3, 7249893), (7, 3107097), (9, 2416631), (21, 1035699), (49, 443871), (63, 345233), (147, 147957), (149, 145971), (331, 65709), (441, 49319), (447, 48657), (993, 21903), (1043, 20853), (1341, 16219), (2317, 9387), (2979, 7301), (3129, 6951)]