21521640

素因数分解:

$2^3\times 3^1\times 5^1\times 7^1\times {\mathrm{25621}}^1$

素因数の和:25642

約数の個数: 64

約数和(自身を含む): 73791360

約数和(自身を除く): 52269720

約数列:

[1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 20, 21, 24, 28, 30, 35, 40, 42, 56, 60, 70, 84, 105, 120, 140, 168, 210, 280, 420, 840, 25621, 51242, 76863, 102484, 128105, 153726, 179347, 204968, 256210, 307452, 358694, 384315, 512420, 538041, 614904, 717388, 768630, 896735, 1024840, 1076082, 1434776, 1537260, 1793470, 2152164, 2690205, 3074520, 3586940, 4304328, 5380410, 7173880, 10760820, 21521640]

約数ペア:

[(1, 21521640), (2, 10760820), (3, 7173880), (4, 5380410), (5, 4304328), (6, 3586940), (7, 3074520), (8, 2690205), (10, 2152164), (12, 1793470), (14, 1537260), (15, 1434776), (20, 1076082), (21, 1024840), (24, 896735), (28, 768630), (30, 717388), (35, 614904), (40, 538041), (42, 512420), (56, 384315), (60, 358694), (70, 307452), (84, 256210), (105, 204968), (120, 179347), (140, 153726), (168, 128105), (210, 102484), (280, 76863), (420, 51242), (840, 25621)]