21001780

素因数分解:

$2^2\times 5^1\times {\mathrm{53}}^1\times {\mathrm{19813}}^1$

素因数の和:19875

約数の個数: 24

約数和(自身を含む): 44938152

約数和(自身を除く): 23936372

約数列:

[1, 2, 4, 5, 10, 20, 53, 106, 212, 265, 530, 1060, 19813, 39626, 79252, 99065, 198130, 396260, 1050089, 2100178, 4200356, 5250445, 10500890, 21001780]

約数ペア:

[(1, 21001780), (2, 10500890), (4, 5250445), (5, 4200356), (10, 2100178), (20, 1050089), (53, 396260), (106, 198130), (212, 99065), (265, 79252), (530, 39626), (1060, 19813)]