8020000

素因数分解:

$2^5\times 5^4\times {\mathrm{401}}^1$

素因数の和:431

約数の個数: 60

約数和(自身を含む): 19779606

約数和(自身を除く): 11759606

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 125, 160, 200, 250, 400, 401, 500, 625, 800, 802, 1000, 1250, 1604, 2000, 2005, 2500, 3208, 4000, 4010, 5000, 6416, 8020, 10000, 10025, 12832, 16040, 20000, 20050, 32080, 40100, 50125, 64160, 80200, 100250, 160400, 200500, 250625, 320800, 401000, 501250, 802000, 1002500, 1604000, 2005000, 4010000, 8020000]

約数ペア:

[(1, 8020000), (2, 4010000), (4, 2005000), (5, 1604000), (8, 1002500), (10, 802000), (16, 501250), (20, 401000), (25, 320800), (32, 250625), (40, 200500), (50, 160400), (80, 100250), (100, 80200), (125, 64160), (160, 50125), (200, 40100), (250, 32080), (400, 20050), (401, 20000), (500, 16040), (625, 12832), (800, 10025), (802, 10000), (1000, 8020), (1250, 6416), (1604, 5000), (2000, 4010), (2005, 4000), (2500, 3208)]