20000840

素因数分解:

$2^3\times 5^1\times {\mathrm{17}}^1\times {\mathrm{67}}^1\times {\mathrm{439}}^1$

素因数の和:534

約数の個数: 64

約数和(自身を含む): 48470400

約数和(自身を除く): 28469560

約数列:

[1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 67, 68, 85, 134, 136, 170, 268, 335, 340, 439, 536, 670, 680, 878, 1139, 1340, 1756, 2195, 2278, 2680, 3512, 4390, 4556, 5695, 7463, 8780, 9112, 11390, 14926, 17560, 22780, 29413, 29852, 37315, 45560, 58826, 59704, 74630, 117652, 147065, 149260, 235304, 294130, 298520, 500021, 588260, 1000042, 1176520, 2000084, 2500105, 4000168, 5000210, 10000420, 20000840]

約数ペア:

[(1, 20000840), (2, 10000420), (4, 5000210), (5, 4000168), (8, 2500105), (10, 2000084), (17, 1176520), (20, 1000042), (34, 588260), (40, 500021), (67, 298520), (68, 294130), (85, 235304), (134, 149260), (136, 147065), (170, 117652), (268, 74630), (335, 59704), (340, 58826), (439, 45560), (536, 37315), (670, 29852), (680, 29413), (878, 22780), (1139, 17560), (1340, 14926), (1756, 11390), (2195, 9112), (2278, 8780), (2680, 7463), (3512, 5695), (4390, 4556)]