20215000

素因数分解:

$2^3\times 5^4\times {\mathrm{13}}^1\times {\mathrm{311}}^1$

素因数の和:350

約数の個数: 80

約数和(自身を含む): 51171120

約数和(自身を除く): 30956120

約数列:

[1, 2, 4, 5, 8, 10, 13, 20, 25, 26, 40, 50, 52, 65, 100, 104, 125, 130, 200, 250, 260, 311, 325, 500, 520, 622, 625, 650, 1000, 1244, 1250, 1300, 1555, 1625, 2488, 2500, 2600, 3110, 3250, 4043, 5000, 6220, 6500, 7775, 8086, 8125, 12440, 13000, 15550, 16172, 16250, 20215, 31100, 32344, 32500, 38875, 40430, 62200, 65000, 77750, 80860, 101075, 155500, 161720, 194375, 202150, 311000, 388750, 404300, 505375, 777500, 808600, 1010750, 1555000, 2021500, 2526875, 4043000, 5053750, 10107500, 20215000]

約数ペア:

[(1, 20215000), (2, 10107500), (4, 5053750), (5, 4043000), (8, 2526875), (10, 2021500), (13, 1555000), (20, 1010750), (25, 808600), (26, 777500), (40, 505375), (50, 404300), (52, 388750), (65, 311000), (100, 202150), (104, 194375), (125, 161720), (130, 155500), (200, 101075), (250, 80860), (260, 77750), (311, 65000), (325, 62200), (500, 40430), (520, 38875), (622, 32500), (625, 32344), (650, 31100), (1000, 20215), (1244, 16250), (1250, 16172), (1300, 15550), (1555, 13000), (1625, 12440), (2488, 8125), (2500, 8086), (2600, 7775), (3110, 6500), (3250, 6220), (4043, 5000)]