81585920

素因数分解:

$2^8\times 5^1\times {\mathrm{13}}^1\times {\mathrm{4903}}^1$

素因数の和:4937

約数の個数: 72

約数和(自身を含む): 210499296

約数和(自身を除く): 128913376

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 32, 40, 52, 64, 65, 80, 104, 128, 130, 160, 208, 256, 260, 320, 416, 520, 640, 832, 1040, 1280, 1664, 2080, 3328, 4160, 4903, 8320, 9806, 16640, 19612, 24515, 39224, 49030, 63739, 78448, 98060, 127478, 156896, 196120, 254956, 313792, 318695, 392240, 509912, 627584, 637390, 784480, 1019824, 1255168, 1274780, 1568960, 2039648, 2549560, 3137920, 4079296, 5099120, 6275840, 8158592, 10198240, 16317184, 20396480, 40792960, 81585920]

約数ペア:

[(1, 81585920), (2, 40792960), (4, 20396480), (5, 16317184), (8, 10198240), (10, 8158592), (13, 6275840), (16, 5099120), (20, 4079296), (26, 3137920), (32, 2549560), (40, 2039648), (52, 1568960), (64, 1274780), (65, 1255168), (80, 1019824), (104, 784480), (128, 637390), (130, 627584), (160, 509912), (208, 392240), (256, 318695), (260, 313792), (320, 254956), (416, 196120), (520, 156896), (640, 127478), (832, 98060), (1040, 78448), (1280, 63739), (1664, 49030), (2080, 39224), (3328, 24515), (4160, 19612), (4903, 16640), (8320, 9806)]