20050000

素因数分解:

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

素因数の和:434

約数の個数: 60

約数和(自身を含む): 48676572

約数和(自身を除く): 28626572

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 125, 200, 250, 400, 401, 500, 625, 802, 1000, 1250, 1604, 2000, 2005, 2500, 3125, 3208, 4010, 5000, 6250, 6416, 8020, 10000, 10025, 12500, 16040, 20050, 25000, 32080, 40100, 50000, 50125, 80200, 100250, 160400, 200500, 250625, 401000, 501250, 802000, 1002500, 1253125, 2005000, 2506250, 4010000, 5012500, 10025000, 20050000]

約数ペア:

[(1, 20050000), (2, 10025000), (4, 5012500), (5, 4010000), (8, 2506250), (10, 2005000), (16, 1253125), (20, 1002500), (25, 802000), (40, 501250), (50, 401000), (80, 250625), (100, 200500), (125, 160400), (200, 100250), (250, 80200), (400, 50125), (401, 50000), (500, 40100), (625, 32080), (802, 25000), (1000, 20050), (1250, 16040), (1604, 12500), (2000, 10025), (2005, 10000), (2500, 8020), (3125, 6416), (3208, 6250), (4010, 5000)]