197980

素因数分解:

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

素因数の和:549

約数の個数: 24

約数和(自身を含む): 438480

約数和(自身を除く): 240500

約数列:

[1, 2, 4, 5, 10, 19, 20, 38, 76, 95, 190, 380, 521, 1042, 2084, 2605, 5210, 9899, 10420, 19798, 39596, 49495, 98990, 197980]

約数ペア:

[(1, 197980), (2, 98990), (4, 49495), (5, 39596), (10, 19798), (19, 10420), (20, 9899), (38, 5210), (76, 2605), (95, 2084), (190, 1042), (380, 521)]