2020000

素因数分解:

$2^5\times 5^4\times {\mathrm{101}}^1$

素因数の和:131

約数の個数: 60

約数和(自身を含む): 5018706

約数和(自身を除く): 2998706

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 101, 125, 160, 200, 202, 250, 400, 404, 500, 505, 625, 800, 808, 1000, 1010, 1250, 1616, 2000, 2020, 2500, 2525, 3232, 4000, 4040, 5000, 5050, 8080, 10000, 10100, 12625, 16160, 20000, 20200, 25250, 40400, 50500, 63125, 80800, 101000, 126250, 202000, 252500, 404000, 505000, 1010000, 2020000]

約数ペア:

[(1, 2020000), (2, 1010000), (4, 505000), (5, 404000), (8, 252500), (10, 202000), (16, 126250), (20, 101000), (25, 80800), (32, 63125), (40, 50500), (50, 40400), (80, 25250), (100, 20200), (101, 20000), (125, 16160), (160, 12625), (200, 10100), (202, 10000), (250, 8080), (400, 5050), (404, 5000), (500, 4040), (505, 4000), (625, 3232), (800, 2525), (808, 2500), (1000, 2020), (1010, 2000), (1250, 1616)]