21795670

素因数分解:

$2^1\times 5^1\times {\mathrm{13}}^1\times {\mathrm{389}}^1\times {\mathrm{431}}^1$

素因数の和:840

約数の個数: 32

約数和(自身を含む): 42456960

約数和(自身を除く): 20661290

約数列:

[1, 2, 5, 10, 13, 26, 65, 130, 389, 431, 778, 862, 1945, 2155, 3890, 4310, 5057, 5603, 10114, 11206, 25285, 28015, 50570, 56030, 167659, 335318, 838295, 1676590, 2179567, 4359134, 10897835, 21795670]

約数ペア:

[(1, 21795670), (2, 10897835), (5, 4359134), (10, 2179567), (13, 1676590), (26, 838295), (65, 335318), (130, 167659), (389, 56030), (431, 50570), (778, 28015), (862, 25285), (1945, 11206), (2155, 10114), (3890, 5603), (4310, 5057)]