21008720

素因数分解:

$2^4\times 5^1\times {\mathrm{59}}^1\times {\mathrm{4451}}^1$

素因数の和:4523

約数の個数: 40

約数和(自身を含む): 49684320

約数和(自身を除く): 28675600

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 59, 80, 118, 236, 295, 472, 590, 944, 1180, 2360, 4451, 4720, 8902, 17804, 22255, 35608, 44510, 71216, 89020, 178040, 262609, 356080, 525218, 1050436, 1313045, 2100872, 2626090, 4201744, 5252180, 10504360, 21008720]

約数ペア:

[(1, 21008720), (2, 10504360), (4, 5252180), (5, 4201744), (8, 2626090), (10, 2100872), (16, 1313045), (20, 1050436), (40, 525218), (59, 356080), (80, 262609), (118, 178040), (236, 89020), (295, 71216), (472, 44510), (590, 35608), (944, 22255), (1180, 17804), (2360, 8902), (4451, 4720)]