21988720

素因数分解:

$2^4\times 5^1\times {\mathrm{13}}^1\times {\mathrm{21143}}^1$

素因数の和:21169

約数の個数: 40

約数和(自身を含む): 55058976

約数和(自身を除く): 33070256

約数列:

[1, 2, 4, 5, 8, 10, 13, 16, 20, 26, 40, 52, 65, 80, 104, 130, 208, 260, 520, 1040, 21143, 42286, 84572, 105715, 169144, 211430, 274859, 338288, 422860, 549718, 845720, 1099436, 1374295, 1691440, 2198872, 2748590, 4397744, 5497180, 10994360, 21988720]

約数ペア:

[(1, 21988720), (2, 10994360), (4, 5497180), (5, 4397744), (8, 2748590), (10, 2198872), (13, 1691440), (16, 1374295), (20, 1099436), (26, 845720), (40, 549718), (52, 422860), (65, 338288), (80, 274859), (104, 211430), (130, 169144), (208, 105715), (260, 84572), (520, 42286), (1040, 21143)]