81685720

素因数分解:

$2^3\times 5^1\times {\mathrm{53}}^2\times {\mathrm{727}}^1$

素因数の和:844

約数の個数: 48

約数和(自身を含む): 187583760

約数和(自身を除く): 105898040

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 53, 106, 212, 265, 424, 530, 727, 1060, 1454, 2120, 2809, 2908, 3635, 5618, 5816, 7270, 11236, 14045, 14540, 22472, 28090, 29080, 38531, 56180, 77062, 112360, 154124, 192655, 308248, 385310, 770620, 1541240, 2042143, 4084286, 8168572, 10210715, 16337144, 20421430, 40842860, 81685720]

約数ペア:

[(1, 81685720), (2, 40842860), (4, 20421430), (5, 16337144), (8, 10210715), (10, 8168572), (20, 4084286), (40, 2042143), (53, 1541240), (106, 770620), (212, 385310), (265, 308248), (424, 192655), (530, 154124), (727, 112360), (1060, 77062), (1454, 56180), (2120, 38531), (2809, 29080), (2908, 28090), (3635, 22472), (5618, 14540), (5816, 14045), (7270, 11236)]