81378220

素因数分解:

$2^2\times 5^1\times 7^2\times {\mathrm{11}}^1\times {\mathrm{7549}}^1$

素因数の和:7583

約数の個数: 72

約数和(自身を含む): 216896400

約数和(自身を除く): 135518180

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 20, 22, 28, 35, 44, 49, 55, 70, 77, 98, 110, 140, 154, 196, 220, 245, 308, 385, 490, 539, 770, 980, 1078, 1540, 2156, 2695, 5390, 7549, 10780, 15098, 30196, 37745, 52843, 75490, 83039, 105686, 150980, 166078, 211372, 264215, 332156, 369901, 415195, 528430, 581273, 739802, 830390, 1056860, 1162546, 1479604, 1660780, 1849505, 2325092, 2906365, 3699010, 4068911, 5812730, 7398020, 8137822, 11625460, 16275644, 20344555, 40689110, 81378220]

約数ペア:

[(1, 81378220), (2, 40689110), (4, 20344555), (5, 16275644), (7, 11625460), (10, 8137822), (11, 7398020), (14, 5812730), (20, 4068911), (22, 3699010), (28, 2906365), (35, 2325092), (44, 1849505), (49, 1660780), (55, 1479604), (70, 1162546), (77, 1056860), (98, 830390), (110, 739802), (140, 581273), (154, 528430), (196, 415195), (220, 369901), (245, 332156), (308, 264215), (385, 211372), (490, 166078), (539, 150980), (770, 105686), (980, 83039), (1078, 75490), (1540, 52843), (2156, 37745), (2695, 30196), (5390, 15098), (7549, 10780)]