20851280

素因数分解:

$2^4\times 5^1\times {\mathrm{71}}^1\times {\mathrm{3671}}^1$

素因数の和:3755

約数の個数: 40

約数和(自身を含む): 49175424

約数和(自身を除く): 28324144

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 71, 80, 142, 284, 355, 568, 710, 1136, 1420, 2840, 3671, 5680, 7342, 14684, 18355, 29368, 36710, 58736, 73420, 146840, 260641, 293680, 521282, 1042564, 1303205, 2085128, 2606410, 4170256, 5212820, 10425640, 20851280]

約数ペア:

[(1, 20851280), (2, 10425640), (4, 5212820), (5, 4170256), (8, 2606410), (10, 2085128), (16, 1303205), (20, 1042564), (40, 521282), (71, 293680), (80, 260641), (142, 146840), (284, 73420), (355, 58736), (568, 36710), (710, 29368), (1136, 18355), (1420, 14684), (2840, 7342), (3671, 5680)]