21395890

素因数分解:

$2^1\times 5^1\times {\mathrm{31}}^1\times {\mathrm{69019}}^1$

素因数の和:69057

約数の個数: 16

約数和(自身を含む): 39755520

約数和(自身を除く): 18359630

約数列:

[1, 2, 5, 10, 31, 62, 155, 310, 69019, 138038, 345095, 690190, 2139589, 4279178, 10697945, 21395890]

約数ペア:

[(1, 21395890), (2, 10697945), (5, 4279178), (10, 2139589), (31, 690190), (62, 345095), (155, 138038), (310, 69019)]