21980000

素因数分解:

$2^5\times 5^4\times 7^1\times {\mathrm{157}}^1$

素因数の和:194

約数の個数: 120

約数和(自身を含む): 62192592

約数和(自身を除く): 40212592

約数列:

[1, 2, 4, 5, 7, 8, 10, 14, 16, 20, 25, 28, 32, 35, 40, 50, 56, 70, 80, 100, 112, 125, 140, 157, 160, 175, 200, 224, 250, 280, 314, 350, 400, 500, 560, 625, 628, 700, 785, 800, 875, 1000, 1099, 1120, 1250, 1256, 1400, 1570, 1750, 2000, 2198, 2500, 2512, 2800, 3140, 3500, 3925, 4000, 4375, 4396, 5000, 5024, 5495, 5600, 6280, 7000, 7850, 8750, 8792, 10000, 10990, 12560, 14000, 15700, 17500, 17584, 19625, 20000, 21980, 25120, 27475, 28000, 31400, 35000, 35168, 39250, 43960, 54950, 62800, 70000, 78500, 87920, 98125, 109900, 125600, 137375, 140000, 157000, 175840, 196250, 219800, 274750, 314000, 392500, 439600, 549500, 628000, 686875, 785000, 879200, 1099000, 1373750, 1570000, 2198000, 2747500, 3140000, 4396000, 5495000, 10990000, 21980000]

約数ペア:

[(1, 21980000), (2, 10990000), (4, 5495000), (5, 4396000), (7, 3140000), (8, 2747500), (10, 2198000), (14, 1570000), (16, 1373750), (20, 1099000), (25, 879200), (28, 785000), (32, 686875), (35, 628000), (40, 549500), (50, 439600), (56, 392500), (70, 314000), (80, 274750), (100, 219800), (112, 196250), (125, 175840), (140, 157000), (157, 140000), (160, 137375), (175, 125600), (200, 109900), (224, 98125), (250, 87920), (280, 78500), (314, 70000), (350, 62800), (400, 54950), (500, 43960), (560, 39250), (625, 35168), (628, 35000), (700, 31400), (785, 28000), (800, 27475), (875, 25120), (1000, 21980), (1099, 20000), (1120, 19625), (1250, 17584), (1256, 17500), (1400, 15700), (1570, 14000), (1750, 12560), (2000, 10990), (2198, 10000), (2500, 8792), (2512, 8750), (2800, 7850), (3140, 7000), (3500, 6280), (3925, 5600), (4000, 5495), (4375, 5024), (4396, 5000)]