820012840

素因数分解:

$2^3\times 5^1\times {\mathrm{131}}^1\times {\mathrm{156491}}^1$

素因数の和:156633

約数の個数: 32

約数和(自身を含む): 1859124960

約数和(自身を除く): 1039112120

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 131, 262, 524, 655, 1048, 1310, 2620, 5240, 156491, 312982, 625964, 782455, 1251928, 1564910, 3129820, 6259640, 20500321, 41000642, 82001284, 102501605, 164002568, 205003210, 410006420, 820012840]

約数ペア:

[(1, 820012840), (2, 410006420), (4, 205003210), (5, 164002568), (8, 102501605), (10, 82001284), (20, 41000642), (40, 20500321), (131, 6259640), (262, 3129820), (524, 1564910), (655, 1251928), (1048, 782455), (1310, 625964), (2620, 312982), (5240, 156491)]