31991780

素因数分解:

$2^2\times 5^1\times {\mathrm{401}}^1\times {\mathrm{3989}}^1$

素因数の和:4399

約数の個数: 24

約数和(自身を含む): 67367160

約数和(自身を除く): 35375380

約数列:

[1, 2, 4, 5, 10, 20, 401, 802, 1604, 2005, 3989, 4010, 7978, 8020, 15956, 19945, 39890, 79780, 1599589, 3199178, 6398356, 7997945, 15995890, 31991780]

約数ペア:

[(1, 31991780), (2, 15995890), (4, 7997945), (5, 6398356), (10, 3199178), (20, 1599589), (401, 79780), (802, 39890), (1604, 19945), (2005, 15956), (3989, 8020), (4010, 7978)]