21706820

素因数分解:

$2^2\times 5^1\times {\mathrm{31}}^1\times {\mathrm{157}}^1\times {\mathrm{223}}^1$

素因数の和:420

約数の個数: 48

約数和(自身を含む): 47566848

約数和(自身を除く): 25860028

約数列:

[1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 157, 223, 310, 314, 446, 620, 628, 785, 892, 1115, 1570, 2230, 3140, 4460, 4867, 6913, 9734, 13826, 19468, 24335, 27652, 34565, 35011, 48670, 69130, 70022, 97340, 138260, 140044, 175055, 350110, 700220, 1085341, 2170682, 4341364, 5426705, 10853410, 21706820]

約数ペア:

[(1, 21706820), (2, 10853410), (4, 5426705), (5, 4341364), (10, 2170682), (20, 1085341), (31, 700220), (62, 350110), (124, 175055), (155, 140044), (157, 138260), (223, 97340), (310, 70022), (314, 69130), (446, 48670), (620, 35011), (628, 34565), (785, 27652), (892, 24335), (1115, 19468), (1570, 13826), (2230, 9734), (3140, 6913), (4460, 4867)]