20408800

素因数分解:

$2^5\times 5^2\times {\mathrm{97}}^1\times {\mathrm{263}}^1$

素因数の和:380

約数の個数: 72

約数和(自身を含む): 50528016

約数和(自身を除く): 30119216

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 97, 100, 160, 194, 200, 263, 388, 400, 485, 526, 776, 800, 970, 1052, 1315, 1552, 1940, 2104, 2425, 2630, 3104, 3880, 4208, 4850, 5260, 6575, 7760, 8416, 9700, 10520, 13150, 15520, 19400, 21040, 25511, 26300, 38800, 42080, 51022, 52600, 77600, 102044, 105200, 127555, 204088, 210400, 255110, 408176, 510220, 637775, 816352, 1020440, 1275550, 2040880, 2551100, 4081760, 5102200, 10204400, 20408800]

約数ペア:

[(1, 20408800), (2, 10204400), (4, 5102200), (5, 4081760), (8, 2551100), (10, 2040880), (16, 1275550), (20, 1020440), (25, 816352), (32, 637775), (40, 510220), (50, 408176), (80, 255110), (97, 210400), (100, 204088), (160, 127555), (194, 105200), (200, 102044), (263, 77600), (388, 52600), (400, 51022), (485, 42080), (526, 38800), (776, 26300), (800, 25511), (970, 21040), (1052, 19400), (1315, 15520), (1552, 13150), (1940, 10520), (2104, 9700), (2425, 8416), (2630, 7760), (3104, 6575), (3880, 5260), (4208, 4850)]