18008840

素因数分解:

$2^3\times 5^1\times {\mathrm{41}}^1\times {\mathrm{79}}^1\times {\mathrm{139}}^1$

素因数の和:270

約数の個数: 64

約数和(自身を含む): 42336000

約数和(自身を除く): 24327160

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 41, 79, 82, 139, 158, 164, 205, 278, 316, 328, 395, 410, 556, 632, 695, 790, 820, 1112, 1390, 1580, 1640, 2780, 3160, 3239, 5560, 5699, 6478, 10981, 11398, 12956, 16195, 21962, 22796, 25912, 28495, 32390, 43924, 45592, 54905, 56990, 64780, 87848, 109810, 113980, 129560, 219620, 227960, 439240, 450221, 900442, 1800884, 2251105, 3601768, 4502210, 9004420, 18008840]

約数ペア:

[(1, 18008840), (2, 9004420), (4, 4502210), (5, 3601768), (8, 2251105), (10, 1800884), (20, 900442), (40, 450221), (41, 439240), (79, 227960), (82, 219620), (139, 129560), (158, 113980), (164, 109810), (205, 87848), (278, 64780), (316, 56990), (328, 54905), (395, 45592), (410, 43924), (556, 32390), (632, 28495), (695, 25912), (790, 22796), (820, 21962), (1112, 16195), (1390, 12956), (1580, 11398), (1640, 10981), (2780, 6478), (3160, 5699), (3239, 5560)]