21331720

素因数分解:

$2^3\times 5^1\times {\mathrm{31}}^1\times {\mathrm{17203}}^1$

素因数の和:17245

約数の個数: 32

約数和(自身を含む): 49547520

約数和(自身を除く): 28215800

約数列:

[1, 2, 4, 5, 8, 10, 20, 31, 40, 62, 124, 155, 248, 310, 620, 1240, 17203, 34406, 68812, 86015, 137624, 172030, 344060, 533293, 688120, 1066586, 2133172, 2666465, 4266344, 5332930, 10665860, 21331720]

約数ペア:

[(1, 21331720), (2, 10665860), (4, 5332930), (5, 4266344), (8, 2666465), (10, 2133172), (20, 1066586), (31, 688120), (40, 533293), (62, 344060), (124, 172030), (155, 137624), (248, 86015), (310, 68812), (620, 34406), (1240, 17203)]