21084040

素因数分解:

$2^3\times 5^1\times {\mathrm{61}}^1\times {\mathrm{8641}}^1$

素因数の和:8713

約数の個数: 32

約数和(自身を含む): 48222360

約数和(自身を除く): 27138320

約数列:

[1, 2, 4, 5, 8, 10, 20, 40, 61, 122, 244, 305, 488, 610, 1220, 2440, 8641, 17282, 34564, 43205, 69128, 86410, 172820, 345640, 527101, 1054202, 2108404, 2635505, 4216808, 5271010, 10542020, 21084040]

約数ペア:

[(1, 21084040), (2, 10542020), (4, 5271010), (5, 4216808), (8, 2635505), (10, 2108404), (20, 1054202), (40, 527101), (61, 345640), (122, 172820), (244, 86410), (305, 69128), (488, 43205), (610, 34564), (1220, 17282), (2440, 8641)]