21076880

素因数分解:

$2^4\times 5^1\times {\mathrm{11}}^1\times {\mathrm{43}}^1\times {\mathrm{557}}^1$

素因数の和:624

約数の個数: 80

約数和(自身を含む): 54800064

約数和(自身を除く): 33723184

約数列:

[1, 2, 4, 5, 8, 10, 11, 16, 20, 22, 40, 43, 44, 55, 80, 86, 88, 110, 172, 176, 215, 220, 344, 430, 440, 473, 557, 688, 860, 880, 946, 1114, 1720, 1892, 2228, 2365, 2785, 3440, 3784, 4456, 4730, 5570, 6127, 7568, 8912, 9460, 11140, 12254, 18920, 22280, 23951, 24508, 30635, 37840, 44560, 47902, 49016, 61270, 95804, 98032, 119755, 122540, 191608, 239510, 245080, 263461, 383216, 479020, 490160, 526922, 958040, 1053844, 1317305, 1916080, 2107688, 2634610, 4215376, 5269220, 10538440, 21076880]

約数ペア:

[(1, 21076880), (2, 10538440), (4, 5269220), (5, 4215376), (8, 2634610), (10, 2107688), (11, 1916080), (16, 1317305), (20, 1053844), (22, 958040), (40, 526922), (43, 490160), (44, 479020), (55, 383216), (80, 263461), (86, 245080), (88, 239510), (110, 191608), (172, 122540), (176, 119755), (215, 98032), (220, 95804), (344, 61270), (430, 49016), (440, 47902), (473, 44560), (557, 37840), (688, 30635), (860, 24508), (880, 23951), (946, 22280), (1114, 18920), (1720, 12254), (1892, 11140), (2228, 9460), (2365, 8912), (2785, 7568), (3440, 6127), (3784, 5570), (4456, 4730)]