21720190

素因数分解:

$2^1\times 5^1\times {\mathrm{523}}^1\times {\mathrm{4153}}^1$

素因数の和:4683

約数の個数: 16

約数和(自身を含む): 39180528

約数和(自身を除く): 17460338

約数列:

[1, 2, 5, 10, 523, 1046, 2615, 4153, 5230, 8306, 20765, 41530, 2172019, 4344038, 10860095, 21720190]

約数ペア:

[(1, 21720190), (2, 10860095), (5, 4344038), (10, 2172019), (523, 41530), (1046, 20765), (2615, 8306), (4153, 5230)]