21797360

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{20959}}^1$

素因数の和:20985

約数の個数: 40

約数和(自身を含む): 54579840

約数和(自身を除く): 32782480

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 20959, 41918, 83836, 104795, 167672, 209590, 272467, 335344, 419180, 544934, 838360, 1089868, 1362335, 1676720, 2179736, 2724670, 4359472, 5449340, 10898680, 21797360]

約数ペア:

[(1, 21797360), (2, 10898680), (4, 5449340), (5, 4359472), (8, 2724670), (10, 2179736), (13, 1676720), (16, 1362335), (20, 1089868), (26, 838360), (40, 544934), (52, 419180), (65, 335344), (80, 272467), (104, 209590), (130, 167672), (208, 104795), (260, 83836), (520, 41918), (1040, 20959)]