21220720

素因数分解:

$2^4\times 5^1\times {\mathrm{19}}^1\times {\mathrm{23}}^1\times {\mathrm{607}}^1$

素因数の和:662

約数の個数: 80

約数和(自身を含む): 54282240

約数和(自身を除く): 33061520

約数列:

[1, 2, 4, 5, 8, 10, 16, 19, 20, 23, 38, 40, 46, 76, 80, 92, 95, 115, 152, 184, 190, 230, 304, 368, 380, 437, 460, 607, 760, 874, 920, 1214, 1520, 1748, 1840, 2185, 2428, 3035, 3496, 4370, 4856, 6070, 6992, 8740, 9712, 11533, 12140, 13961, 17480, 23066, 24280, 27922, 34960, 46132, 48560, 55844, 57665, 69805, 92264, 111688, 115330, 139610, 184528, 223376, 230660, 265259, 279220, 461320, 530518, 558440, 922640, 1061036, 1116880, 1326295, 2122072, 2652590, 4244144, 5305180, 10610360, 21220720]

約数ペア:

[(1, 21220720), (2, 10610360), (4, 5305180), (5, 4244144), (8, 2652590), (10, 2122072), (16, 1326295), (19, 1116880), (20, 1061036), (23, 922640), (38, 558440), (40, 530518), (46, 461320), (76, 279220), (80, 265259), (92, 230660), (95, 223376), (115, 184528), (152, 139610), (184, 115330), (190, 111688), (230, 92264), (304, 69805), (368, 57665), (380, 55844), (437, 48560), (460, 46132), (607, 34960), (760, 27922), (874, 24280), (920, 23066), (1214, 17480), (1520, 13961), (1748, 12140), (1840, 11533), (2185, 9712), (2428, 8740), (3035, 6992), (3496, 6070), (4370, 4856)]