20127980

素因数分解:

$2^2\times 5^1\times {\mathrm{223}}^1\times {\mathrm{4513}}^1$

素因数の和:4745

約数の個数: 24

約数和(自身を含む): 42467712

約数和(自身を除く): 22339732

約数列:

[1, 2, 4, 5, 10, 20, 223, 446, 892, 1115, 2230, 4460, 4513, 9026, 18052, 22565, 45130, 90260, 1006399, 2012798, 4025596, 5031995, 10063990, 20127980]

約数ペア:

[(1, 20127980), (2, 10063990), (4, 5031995), (5, 4025596), (10, 2012798), (20, 1006399), (223, 90260), (446, 45130), (892, 22565), (1115, 18052), (2230, 9026), (4460, 4513)]