21428080

素因数分解:

$2^4\times 5^1\times {\mathrm{61}}^1\times {\mathrm{4391}}^1$

素因数の和:4465

約数の個数: 40

約数和(自身を含む): 50648544

約数和(自身を除く): 29220464

約数列:

[1, 2, 4, 5, 8, 10, 16, 20, 40, 61, 80, 122, 244, 305, 488, 610, 976, 1220, 2440, 4391, 4880, 8782, 17564, 21955, 35128, 43910, 70256, 87820, 175640, 267851, 351280, 535702, 1071404, 1339255, 2142808, 2678510, 4285616, 5357020, 10714040, 21428080]

約数ペア:

[(1, 21428080), (2, 10714040), (4, 5357020), (5, 4285616), (8, 2678510), (10, 2142808), (16, 1339255), (20, 1071404), (40, 535702), (61, 351280), (80, 267851), (122, 175640), (244, 87820), (305, 70256), (488, 43910), (610, 35128), (976, 21955), (1220, 17564), (2440, 8782), (4391, 4880)]