9997990

素因数分解:

$2^1\times 5^1\times {\mathrm{19}}^1\times {\mathrm{101}}^1\times {\mathrm{521}}^1$

素因数の和:648

約数の個数: 32

約数和(自身を含む): 19167840

約数和(自身を除く): 9169850

約数列:

[1, 2, 5, 10, 19, 38, 95, 101, 190, 202, 505, 521, 1010, 1042, 1919, 2605, 3838, 5210, 9595, 9899, 19190, 19798, 49495, 52621, 98990, 105242, 263105, 526210, 999799, 1999598, 4998995, 9997990]

約数ペア:

[(1, 9997990), (2, 4998995), (5, 1999598), (10, 999799), (19, 526210), (38, 263105), (95, 105242), (101, 98990), (190, 52621), (202, 49495), (505, 19798), (521, 19190), (1010, 9899), (1042, 9595), (1919, 5210), (2605, 3838)]