400289420

素因数分解:

$2^2\times 5^1\times {\mathrm{109}}^1\times {\mathrm{139}}^1\times {\mathrm{1321}}^1$

素因数の和:1578

約数の個数: 48

約数和(自身を含む): 855069600

約数和(自身を除く): 454780180

約数列:

[1, 2, 4, 5, 10, 20, 109, 139, 218, 278, 436, 545, 556, 695, 1090, 1321, 1390, 2180, 2642, 2780, 5284, 6605, 13210, 15151, 26420, 30302, 60604, 75755, 143989, 151510, 183619, 287978, 303020, 367238, 575956, 719945, 734476, 918095, 1439890, 1836190, 2879780, 3672380, 20014471, 40028942, 80057884, 100072355, 200144710, 400289420]

約数ペア:

[(1, 400289420), (2, 200144710), (4, 100072355), (5, 80057884), (10, 40028942), (20, 20014471), (109, 3672380), (139, 2879780), (218, 1836190), (278, 1439890), (436, 918095), (545, 734476), (556, 719945), (695, 575956), (1090, 367238), (1321, 303020), (1390, 287978), (2180, 183619), (2642, 151510), (2780, 143989), (5284, 75755), (6605, 60604), (13210, 30302), (15151, 26420)]