21915140

素因数分解:

$2^2\times 5^1\times {\mathrm{13}}^1\times {\mathrm{31}}^1\times {\mathrm{2719}}^1$

素因数の和:2772

約数の個数: 48

約数和(自身を含む): 51179520

約数和(自身を除く): 29264380

約数列:

[1, 2, 4, 5, 10, 13, 20, 26, 31, 52, 62, 65, 124, 130, 155, 260, 310, 403, 620, 806, 1612, 2015, 2719, 4030, 5438, 8060, 10876, 13595, 27190, 35347, 54380, 70694, 84289, 141388, 168578, 176735, 337156, 353470, 421445, 706940, 842890, 1095757, 1685780, 2191514, 4383028, 5478785, 10957570, 21915140]

約数ペア:

[(1, 21915140), (2, 10957570), (4, 5478785), (5, 4383028), (10, 2191514), (13, 1685780), (20, 1095757), (26, 842890), (31, 706940), (52, 421445), (62, 353470), (65, 337156), (124, 176735), (130, 168578), (155, 141388), (260, 84289), (310, 70694), (403, 54380), (620, 35347), (806, 27190), (1612, 13595), (2015, 10876), (2719, 8060), (4030, 5438)]