20819000

素因数分解:

$2^3\times 5^3\times {\mathrm{109}}^1\times {\mathrm{191}}^1$

素因数の和:321

約数の個数: 64

約数和(自身を含む): 49420800

約数和(自身を除く): 28601800

約数列:

[1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 109, 125, 191, 200, 218, 250, 382, 436, 500, 545, 764, 872, 955, 1000, 1090, 1528, 1910, 2180, 2725, 3820, 4360, 4775, 5450, 7640, 9550, 10900, 13625, 19100, 20819, 21800, 23875, 27250, 38200, 41638, 47750, 54500, 83276, 95500, 104095, 109000, 166552, 191000, 208190, 416380, 520475, 832760, 1040950, 2081900, 2602375, 4163800, 5204750, 10409500, 20819000]

約数ペア:

[(1, 20819000), (2, 10409500), (4, 5204750), (5, 4163800), (8, 2602375), (10, 2081900), (20, 1040950), (25, 832760), (40, 520475), (50, 416380), (100, 208190), (109, 191000), (125, 166552), (191, 109000), (200, 104095), (218, 95500), (250, 83276), (382, 54500), (436, 47750), (500, 41638), (545, 38200), (764, 27250), (872, 23875), (955, 21800), (1000, 20819), (1090, 19100), (1528, 13625), (1910, 10900), (2180, 9550), (2725, 7640), (3820, 5450), (4360, 4775)]