21063980

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{43}}^1\times {\mathrm{3499}}^1$

素因数の和:3558

約数の個数: 48

約数和(自身を含む): 51744000

約数和(自身を除く): 30680020

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 43, 70, 86, 140, 172, 215, 301, 430, 602, 860, 1204, 1505, 3010, 3499, 6020, 6998, 13996, 17495, 24493, 34990, 48986, 69980, 97972, 122465, 150457, 244930, 300914, 489860, 601828, 752285, 1053199, 1504570, 2106398, 3009140, 4212796, 5265995, 10531990, 21063980]

約数ペア:

[(1, 21063980), (2, 10531990), (4, 5265995), (5, 4212796), (7, 3009140), (10, 2106398), (14, 1504570), (20, 1053199), (28, 752285), (35, 601828), (43, 489860), (70, 300914), (86, 244930), (140, 150457), (172, 122465), (215, 97972), (301, 69980), (430, 48986), (602, 34990), (860, 24493), (1204, 17495), (1505, 13996), (3010, 6998), (3499, 6020)]