20640688

素因数分解:

$2^4\times {\mathrm{19}}^1\times {\mathrm{43}}^1\times {\mathrm{1579}}^1$

素因数の和:1649

約数の個数: 40

約数和(自身を含む): 43102400

約数和(自身を除く): 22461712

約数列:

[1, 2, 4, 8, 16, 19, 38, 43, 76, 86, 152, 172, 304, 344, 688, 817, 1579, 1634, 3158, 3268, 6316, 6536, 12632, 13072, 25264, 30001, 60002, 67897, 120004, 135794, 240008, 271588, 480016, 543176, 1086352, 1290043, 2580086, 5160172, 10320344, 20640688]

約数ペア:

[(1, 20640688), (2, 10320344), (4, 5160172), (8, 2580086), (16, 1290043), (19, 1086352), (38, 543176), (43, 480016), (76, 271588), (86, 240008), (152, 135794), (172, 120004), (304, 67897), (344, 60002), (688, 30001), (817, 25264), (1579, 13072), (1634, 12632), (3158, 6536), (3268, 6316)]