820408280

素因数分解:

$2^3\times 5^1\times {\mathrm{521}}^1\times {\mathrm{39367}}^1$

素因数の和:39899

約数の個数: 32

約数和(自身を含む): 1849508640

約数和(自身を除く): 1029100360

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 521, 1042, 2084, 2605, 4168, 5210, 10420, 20840, 39367, 78734, 157468, 196835, 314936, 393670, 787340, 1574680, 20510207, 41020414, 82040828, 102551035, 164081656, 205102070, 410204140, 820408280]

約数ペア:

[(1, 820408280), (2, 410204140), (4, 205102070), (5, 164081656), (8, 102551035), (10, 82040828), (20, 41020414), (40, 20510207), (521, 1574680), (1042, 787340), (2084, 393670), (2605, 314936), (4168, 196835), (5210, 157468), (10420, 78734), (20840, 39367)]