21571220

素因数分解:

$2^2\times 5^1\times {\mathrm{11}}^1\times {\mathrm{71}}^1\times {\mathrm{1381}}^1$

素因数の和:1472

約数の個数: 48

約数和(自身を含む): 50150016

約数和(自身を除く): 28578796

約数列:

[1, 2, 4, 5, 10, 11, 20, 22, 44, 55, 71, 110, 142, 220, 284, 355, 710, 781, 1381, 1420, 1562, 2762, 3124, 3905, 5524, 6905, 7810, 13810, 15191, 15620, 27620, 30382, 60764, 75955, 98051, 151910, 196102, 303820, 392204, 490255, 980510, 1078561, 1961020, 2157122, 4314244, 5392805, 10785610, 21571220]

約数ペア:

[(1, 21571220), (2, 10785610), (4, 5392805), (5, 4314244), (10, 2157122), (11, 1961020), (20, 1078561), (22, 980510), (44, 490255), (55, 392204), (71, 303820), (110, 196102), (142, 151910), (220, 98051), (284, 75955), (355, 60764), (710, 30382), (781, 27620), (1381, 15620), (1420, 15191), (1562, 13810), (2762, 7810), (3124, 6905), (3905, 5524)]