81565420

素因数分解:

$2^2\times 5^1\times {\mathrm{277}}^1\times {\mathrm{14723}}^1$

素因数の和:15009

約数の個数: 24

約数和(自身を含む): 171917424

約数和(自身を除く): 90352004

約数列:

[1, 2, 4, 5, 10, 20, 277, 554, 1108, 1385, 2770, 5540, 14723, 29446, 58892, 73615, 147230, 294460, 4078271, 8156542, 16313084, 20391355, 40782710, 81565420]

約数ペア:

[(1, 81565420), (2, 40782710), (4, 20391355), (5, 16313084), (10, 8156542), (20, 4078271), (277, 294460), (554, 147230), (1108, 73615), (1385, 58892), (2770, 29446), (5540, 14723)]