20995990

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{89}}^1\times {\mathrm{761}}^1$

素因数の和:888

約数の個数: 32

約数和(自身を含む): 39502080

約数和(自身を除く): 18506090

約数列:

[1, 2, 5, 10, 31, 62, 89, 155, 178, 310, 445, 761, 890, 1522, 2759, 3805, 5518, 7610, 13795, 23591, 27590, 47182, 67729, 117955, 135458, 235910, 338645, 677290, 2099599, 4199198, 10497995, 20995990]

約数ペア:

[(1, 20995990), (2, 10497995), (5, 4199198), (10, 2099599), (31, 677290), (62, 338645), (89, 235910), (155, 135458), (178, 117955), (310, 67729), (445, 47182), (761, 27590), (890, 23591), (1522, 13795), (2759, 7610), (3805, 5518)]