21281540

素因数分解:

$2^2\times 5^1\times 7^1\times {\mathrm{71}}^1\times {\mathrm{2141}}^1$

素因数の和:2228

約数の個数: 48

約数和(自身を含む): 51819264

約数和(自身を除く): 30537724

約数列:

[1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 71, 140, 142, 284, 355, 497, 710, 994, 1420, 1988, 2141, 2485, 4282, 4970, 8564, 9940, 10705, 14987, 21410, 29974, 42820, 59948, 74935, 149870, 152011, 299740, 304022, 608044, 760055, 1064077, 1520110, 2128154, 3040220, 4256308, 5320385, 10640770, 21281540]

約数ペア:

[(1, 21281540), (2, 10640770), (4, 5320385), (5, 4256308), (7, 3040220), (10, 2128154), (14, 1520110), (20, 1064077), (28, 760055), (35, 608044), (70, 304022), (71, 299740), (140, 152011), (142, 149870), (284, 74935), (355, 59948), (497, 42820), (710, 29974), (994, 21410), (1420, 14987), (1988, 10705), (2141, 9940), (2485, 8564), (4282, 4970)]