20690720

素因数分解:

$2^5\times 5^1\times {\mathrm{89}}^1\times {\mathrm{1453}}^1$

素因数の和:1557

約数の個数: 48

約数和(自身を含む): 49465080

約数和(自身を除く): 28774360

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 80, 89, 160, 178, 356, 445, 712, 890, 1424, 1453, 1780, 2848, 2906, 3560, 5812, 7120, 7265, 11624, 14240, 14530, 23248, 29060, 46496, 58120, 116240, 129317, 232480, 258634, 517268, 646585, 1034536, 1293170, 2069072, 2586340, 4138144, 5172680, 10345360, 20690720]

約数ペア:

[(1, 20690720), (2, 10345360), (4, 5172680), (5, 4138144), (8, 2586340), (10, 2069072), (16, 1293170), (20, 1034536), (32, 646585), (40, 517268), (80, 258634), (89, 232480), (160, 129317), (178, 116240), (356, 58120), (445, 46496), (712, 29060), (890, 23248), (1424, 14530), (1453, 14240), (1780, 11624), (2848, 7265), (2906, 7120), (3560, 5812)]