21440840

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17291}}^1$

素因数の和:17333

約数の個数: 32

約数和(自身を含む): 49800960

約数和(自身を除く): 28360120

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17291, 34582, 69164, 86455, 138328, 172910, 345820, 536021, 691640, 1072042, 2144084, 2680105, 4288168, 5360210, 10720420, 21440840]

約数ペア:

[(1, 21440840), (2, 10720420), (4, 5360210), (5, 4288168), (8, 2680105), (10, 2144084), (20, 1072042), (31, 691640), (40, 536021), (62, 345820), (124, 172910), (155, 138328), (248, 86455), (310, 69164), (620, 34582), (1240, 17291)]