21489895

素因数分解:

$5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{109}}^1\times {\mathrm{131}}^1$

素因数の和:295

約数の個数: 32

約数和(自身を含む): 30666240

約数和(自身を除く): 9176345

約数列:

[1, 5, 7, 35, 43, 109, 131, 215, 301, 545, 655, 763, 917, 1505, 3815, 4585, 4687, 5633, 14279, 23435, 28165, 32809, 39431, 71395, 99953, 164045, 197155, 499765, 613997, 3069985, 4297979, 21489895]

約数ペア:

[(1, 21489895), (5, 4297979), (7, 3069985), (35, 613997), (43, 499765), (109, 197155), (131, 164045), (215, 99953), (301, 71395), (545, 39431), (655, 32809), (763, 28165), (917, 23435), (1505, 14279), (3815, 5633), (4585, 4687)]