19908820

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{163}}^1\times {\mathrm{197}}^1$

素因数の和:400

約数の個数: 48

約数和(自身を含む): 43642368

約数和(自身を除く): 23733548

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 163, 197, 310, 326, 394, 620, 652, 788, 815, 985, 1630, 1970, 3260, 3940, 5053, 6107, 10106, 12214, 20212, 24428, 25265, 30535, 32111, 50530, 61070, 64222, 101060, 122140, 128444, 160555, 321110, 642220, 995441, 1990882, 3981764, 4977205, 9954410, 19908820]

約数ペア:

[(1, 19908820), (2, 9954410), (4, 4977205), (5, 3981764), (10, 1990882), (20, 995441), (31, 642220), (62, 321110), (124, 160555), (155, 128444), (163, 122140), (197, 101060), (310, 64222), (326, 61070), (394, 50530), (620, 32111), (652, 30535), (788, 25265), (815, 24428), (985, 20212), (1630, 12214), (1970, 10106), (3260, 6107), (3940, 5053)]