21073520

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{23}}^1\times {\mathrm{881}}^1$

素因数の和:930

約数の個数: 80

約数和(自身を含む): 55121472

約数和(自身を除く): 34047952

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 23, 26, 40, 46, 52, 65, 80, 92, 104, 115, 130, 184, 208, 230, 260, 299, 368, 460, 520, 598, 881, 920, 1040, 1196, 1495, 1762, 1840, 2392, 2990, 3524, 4405, 4784, 5980, 7048, 8810, 11453, 11960, 14096, 17620, 20263, 22906, 23920, 35240, 40526, 45812, 57265, 70480, 81052, 91624, 101315, 114530, 162104, 183248, 202630, 229060, 263419, 324208, 405260, 458120, 526838, 810520, 916240, 1053676, 1317095, 1621040, 2107352, 2634190, 4214704, 5268380, 10536760, 21073520]

約数ペア:

[(1, 21073520), (2, 10536760), (4, 5268380), (5, 4214704), (8, 2634190), (10, 2107352), (13, 1621040), (16, 1317095), (20, 1053676), (23, 916240), (26, 810520), (40, 526838), (46, 458120), (52, 405260), (65, 324208), (80, 263419), (92, 229060), (104, 202630), (115, 183248), (130, 162104), (184, 114530), (208, 101315), (230, 91624), (260, 81052), (299, 70480), (368, 57265), (460, 45812), (520, 40526), (598, 35240), (881, 23920), (920, 22906), (1040, 20263), (1196, 17620), (1495, 14096), (1762, 11960), (1840, 11453), (2392, 8810), (2990, 7048), (3524, 5980), (4405, 4784)]