19811840

素因数分解:

$2^9\times 5^1\times {\mathrm{71}}^1\times {\mathrm{109}}^1$

素因数の和:203

約数の個数: 80

約数和(自身を含む): 48612960

約数和(自身を除く): 28801120

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 71, 80, 109, 128, 142, 160, 218, 256, 284, 320, 355, 436, 512, 545, 568, 640, 710, 872, 1090, 1136, 1280, 1420, 1744, 2180, 2272, 2560, 2840, 3488, 4360, 4544, 5680, 6976, 7739, 8720, 9088, 11360, 13952, 15478, 17440, 18176, 22720, 27904, 30956, 34880, 36352, 38695, 45440, 55808, 61912, 69760, 77390, 90880, 123824, 139520, 154780, 181760, 247648, 279040, 309560, 495296, 619120, 990592, 1238240, 1981184, 2476480, 3962368, 4952960, 9905920, 19811840]

約数ペア:

[(1, 19811840), (2, 9905920), (4, 4952960), (5, 3962368), (8, 2476480), (10, 1981184), (16, 1238240), (20, 990592), (32, 619120), (40, 495296), (64, 309560), (71, 279040), (80, 247648), (109, 181760), (128, 154780), (142, 139520), (160, 123824), (218, 90880), (256, 77390), (284, 69760), (320, 61912), (355, 55808), (436, 45440), (512, 38695), (545, 36352), (568, 34880), (640, 30956), (710, 27904), (872, 22720), (1090, 18176), (1136, 17440), (1280, 15478), (1420, 13952), (1744, 11360), (2180, 9088), (2272, 8720), (2560, 7739), (2840, 6976), (3488, 5680), (4360, 4544)]