4001980

素因数分解:

$2^2\times 5^1\times {\mathrm{401}}^1\times {\mathrm{499}}^1$

素因数の和:909

約数の個数: 24

約数和(自身を含む): 8442000

約数和(自身を除く): 4440020

約数列:

[1, 2, 4, 5, 10, 20, 401, 499, 802, 998, 1604, 1996, 2005, 2495, 4010, 4990, 8020, 9980, 200099, 400198, 800396, 1000495, 2000990, 4001980]

約数ペア:

[(1, 4001980), (2, 2000990), (4, 1000495), (5, 800396), (10, 400198), (20, 200099), (401, 9980), (499, 8020), (802, 4990), (998, 4010), (1604, 2495), (1996, 2005)]