20538880

素因数分解:

$2^9\times 5^1\times {\mathrm{71}}^1\times {\mathrm{113}}^1$

素因数の和:207

約数の個数: 80

約数和(自身を含む): 50380704

約数和(自身を除く): 29841824

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 71, 80, 113, 128, 142, 160, 226, 256, 284, 320, 355, 452, 512, 565, 568, 640, 710, 904, 1130, 1136, 1280, 1420, 1808, 2260, 2272, 2560, 2840, 3616, 4520, 4544, 5680, 7232, 8023, 9040, 9088, 11360, 14464, 16046, 18080, 18176, 22720, 28928, 32092, 36160, 36352, 40115, 45440, 57856, 64184, 72320, 80230, 90880, 128368, 144640, 160460, 181760, 256736, 289280, 320920, 513472, 641840, 1026944, 1283680, 2053888, 2567360, 4107776, 5134720, 10269440, 20538880]

約数ペア:

[(1, 20538880), (2, 10269440), (4, 5134720), (5, 4107776), (8, 2567360), (10, 2053888), (16, 1283680), (20, 1026944), (32, 641840), (40, 513472), (64, 320920), (71, 289280), (80, 256736), (113, 181760), (128, 160460), (142, 144640), (160, 128368), (226, 90880), (256, 80230), (284, 72320), (320, 64184), (355, 57856), (452, 45440), (512, 40115), (565, 36352), (568, 36160), (640, 32092), (710, 28928), (904, 22720), (1130, 18176), (1136, 18080), (1280, 16046), (1420, 14464), (1808, 11360), (2260, 9088), (2272, 9040), (2560, 8023), (2840, 7232), (3616, 5680), (4520, 4544)]