21316390

素因数分解:

$2^1\times 5^1\times {\mathrm{43}}^1\times {\mathrm{89}}^1\times {\mathrm{557}}^1$

素因数の和:696

約数の個数: 32

約数和(自身を含む): 39774240

約数和(自身を除く): 18457850

約数列:

[1, 2, 5, 10, 43, 86, 89, 178, 215, 430, 445, 557, 890, 1114, 2785, 3827, 5570, 7654, 19135, 23951, 38270, 47902, 49573, 99146, 119755, 239510, 247865, 495730, 2131639, 4263278, 10658195, 21316390]

約数ペア:

[(1, 21316390), (2, 10658195), (5, 4263278), (10, 2131639), (43, 495730), (86, 247865), (89, 239510), (178, 119755), (215, 99146), (430, 49573), (445, 47902), (557, 38270), (890, 23951), (1114, 19135), (2785, 7654), (3827, 5570)]