18920860

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{43}}^1\times {\mathrm{449}}^1$

素因数の和:515

約数の個数: 72

約数和(自身を含む): 47401200

約数和(自身を除く): 28480340

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 43, 49, 70, 86, 98, 140, 172, 196, 215, 245, 301, 430, 449, 490, 602, 860, 898, 980, 1204, 1505, 1796, 2107, 2245, 3010, 3143, 4214, 4490, 6020, 6286, 8428, 8980, 10535, 12572, 15715, 19307, 21070, 22001, 31430, 38614, 42140, 44002, 62860, 77228, 88004, 96535, 110005, 135149, 193070, 220010, 270298, 386140, 440020, 540596, 675745, 946043, 1351490, 1892086, 2702980, 3784172, 4730215, 9460430, 18920860]

約数ペア:

[(1, 18920860), (2, 9460430), (4, 4730215), (5, 3784172), (7, 2702980), (10, 1892086), (14, 1351490), (20, 946043), (28, 675745), (35, 540596), (43, 440020), (49, 386140), (70, 270298), (86, 220010), (98, 193070), (140, 135149), (172, 110005), (196, 96535), (215, 88004), (245, 77228), (301, 62860), (430, 44002), (449, 42140), (490, 38614), (602, 31430), (860, 22001), (898, 21070), (980, 19307), (1204, 15715), (1505, 12572), (1796, 10535), (2107, 8980), (2245, 8428), (3010, 6286), (3143, 6020), (4214, 4490)]