21577760

素因数分解:

$2^5\times 5^1\times {\mathrm{17}}^1\times {\mathrm{7933}}^1$

素因数の和:7965

約数の個数: 48

約数和(自身を含む): 53982936

約数和(自身を除く): 32405176

約数列:

[1, 2, 4, 5, 8, 10, 16, 17, 20, 32, 34, 40, 68, 80, 85, 136, 160, 170, 272, 340, 544, 680, 1360, 2720, 7933, 15866, 31732, 39665, 63464, 79330, 126928, 134861, 158660, 253856, 269722, 317320, 539444, 634640, 674305, 1078888, 1269280, 1348610, 2157776, 2697220, 4315552, 5394440, 10788880, 21577760]

約数ペア:

[(1, 21577760), (2, 10788880), (4, 5394440), (5, 4315552), (8, 2697220), (10, 2157776), (16, 1348610), (17, 1269280), (20, 1078888), (32, 674305), (34, 634640), (40, 539444), (68, 317320), (80, 269722), (85, 253856), (136, 158660), (160, 134861), (170, 126928), (272, 79330), (340, 63464), (544, 39665), (680, 31732), (1360, 15866), (2720, 7933)]