19651250

素因数分解:

$2^1\times 5^4\times {\mathrm{79}}^1\times {\mathrm{199}}^1$

素因数の和:300

約数の個数: 40

約数和(自身を含む): 37488000

約数和(自身を除く): 17836750

約数列:

[1, 2, 5, 10, 25, 50, 79, 125, 158, 199, 250, 395, 398, 625, 790, 995, 1250, 1975, 1990, 3950, 4975, 9875, 9950, 15721, 19750, 24875, 31442, 49375, 49750, 78605, 98750, 124375, 157210, 248750, 393025, 786050, 1965125, 3930250, 9825625, 19651250]

約数ペア:

[(1, 19651250), (2, 9825625), (5, 3930250), (10, 1965125), (25, 786050), (50, 393025), (79, 248750), (125, 157210), (158, 124375), (199, 98750), (250, 78605), (395, 49750), (398, 49375), (625, 31442), (790, 24875), (995, 19750), (1250, 15721), (1975, 9950), (1990, 9875), (3950, 4975)]